Category Archives: Fides et Ratio

Apr 3 – Venerable Jerome Lejeune, (1926-1994), Doctor of Down’s Syndrome

Life_is_a_blessing_Clara_Lejeune

Letter to Cardinal George of Chicago:

6/12/2011

Dear Cardinal George,

Hello, my name is Amy Goggin and I am a parishioner at St. John Fisher in Chicago. I’m writing this letter to you to ask for your support and guidance in a cause that has been on my heart recently. I have an on-line store. I make rosaries and religious jewelry. I have wanted to make a chaplet/bracelet for people afflicted with Down’s syndrome. While researching the patron Saint for these individuals, I realized that there is no patron Saint for them. I am wondering how to go about declaring one? How does the Church declare a patron saint?

I understand that there are patron saints for people with mental illnesses and people that are handicapped in one form or another but, there needs to be a specific advocate in heaven for the growing number of people afflicted with Down’s syndrome. Prenatal screening and diagnostic testing is most often used to identify unborn babies with Down’s syndrome and then that information is used to encourage an abortion. This testing does not provide information that could be used to treat the baby before birth. One out of every 800 pregnancies is diagnosed with having a Down’s baby.

That is about 400,000 in the US alone. Out of those, 84% to 91% are aborted in the US. If a mother decides to have her Down’s syndrome child there are many medical complications that are awaiting the child throughout his/her life. There seems to be a cultural war against these innocent human beings right from the start. Due to the large number of people with this condition and the life-threatening situation they find themselves, we as Catholics need an advocate in Heaven to offer up our prayers of both petition and thanksgiving.

While researching a saint that would be appropriate for this cause, I found Servant of God (whose cause for canonization was opened in 2007): Dr. Jerome Lejeune. He was a French Doctor that spent his life trying to find a cure for Down’s syndrome and fighting for an awareness of the sanctity of their lives. He discovered the cause of Down’s syndrome in 1958.

Dr. Lejeune worked closely with Pope John Paul II and was appointed the first president of the Pontifical Academy for Life. He treated around 5,000 patients. He would explain to new mothers that their child’s name was (child’s name) and he/she is not a disease, but a person that happens to have a disease. His mission was to have others understand the dignity that these individuals possessed, by looking beyond their condition to see a human being. His own daughter, Clara Lejeune Gaymard wrote a memoir titled Life is a Blessing about her father .

I believe that due to the nature of Dr. Lejeune’s life’s work, he is the perfect patron saint for people afflicted with this genetic condition. I’m wondering if you can help us with three things by your guidance and blessing. My friends and I are willing to do whatever we have to do, we just need some direction and support. We want to know how to officially request that the Church declare Lejeune the patron saint for people afflicted with Down’s syndrome.

We want to know how to create a chaplet of prayers for his intercession. Finally, there is a strong local support to have a national shrine on the South Side of Chicago for Catholics to come and pray for Lejeune’s intercession for their loved ones with Down’s syndrome. We believe that because of the large population of individuals with this condition on the South Side of Chicago, this would be the most appropriate place for such a shrine. We are willing to take on any logistical legwork necessary to further this cause. I would appreciate any help you can offer my friends and I with this endeavor and look forward to hearing back from you soon.”

dr-lejeune-and-patient1

lejeune

Jerome Lejeune was born in Montrouge, France, in 1926. A reading of The Country Doctor by the French novelist Balzac convinced him of his vocation when he was 13 years old. He too wanted to be a simple country doctor dedicating his life to helping the poor.

After attending medical school, he was persuaded by Professor Raymond Turpin to collaborate with him on a study of Down syndrome. He accepted this challenge and his dreams of being a simple country doctor were laid to rest.

He and his wife Birthe had five children and his family life and his faith were always his priority. When his beloved father was dying of lung cancer, he recognised more deeply the mystery of human suffering and the presence of Christ in all those who suffer.

In 1954, he was appointed a committee member of the French Genetics society and in 1957 was named an expert on the effects of atomic radiation on human genetics by the United Nations.

In 1959 he discovered the cause of Down syndrome and was also to diagnose the first case of Cri du Chat Syndrome. In 1962, he was awarded the prestigious Kennedy prize and, in 1965, he was appointed to the first Chair in Fundamental Genetics at the University of Paris. During this time, he helped thousands of parents to accept and love their children with Down syndrome.

Lejeune-quote
-quote of Dr. Jerome Lejeune, MD, in a letter to his wife after his acceptance speech in 1969 when he was given the William Allan Memorial Award, the highest distinction that could be granted to a Geneticist, in which he strenuously condemned abortion.

In 1991, he wrote a summary of his reflections on medical ethics for his fellow Catholics in seven brief points:

1. Christians, be not afraid. It is you who possess the truth. Not that you invented it but because you are the vehicle for it. To all doctors, you must repeat: “you must conquer the illness, not attack the patient.”
2. We are made in the image of God. For this reason alone all human beings must be respected.
3. Abortion and infanticide are unspeakable crimes.
4. Objective morality exists. It is clear and it is universal – because it is Catholic.
5. The child is not disposable and marriage is indissoluble.
6. “You shall honour your father and mother.” Therefore, uniparental reproduction by any means is always wrong.
7. In so-called pluralistic societies, they shout it down our throats: “You Christians do not have the right to impose your morality on others.” Well, I tell you, not only do you have the right to try to incorporate your morality in the law but it is your democratic duty.

There is a famous story of an American physician who told Lejeune the following:

“My father was a Jewish physician in Braunau, Austria. One day only two babies were born at the local hospital. The parents of the healthy boy were proud and happy. The other was a girl (with Down syndrome) and her parents were sad.”

The physician ended the story by saying that the girl grew up to look after her mother despite her own disability. Her name is not known. The boy’s name was Adolph Hitler. Quite likely the story is apocryphal. However, it does express the truth that was central to Lejeune’s vocation: people with disabilities are certainly no less human than those without.

In 1993, Pope Saint John Paul II, his close friend, appointed Lejeune to be the first president of the Pontifical Academy for Life. That same year he was diagnosed with lung cancer and, by Good Friday of 1994, he was critically ill. “I have never betrayed my faith” he said. While reflecting on his patients, he was moved to tears and said: “I was supposed to have cured them…What will happen to them?”

A little later he was filled with joy. He said: “My children, if I can leave you with one message, this is the most important of all: We are in the hands of God. I have experienced this numbers of times.” He died the next day. Pope Saint John Paul II wrote of him: “We find ourselves today faced with the death of a great Christian of the twentieth century, a man for whom the defense of life had become an apostolate.” His cause for canonization has been postulated. Our bishops have recently agreed on three priorities for the Church, one of which is to proclaim the coming of the Kingdom by supporting integrity in public life, cohesion and mutual respect in society and serving the marginalized and the vulnerable. May this great servant of God, an apostle of the vulnerable, be an example to us all.

Prayer to Obtain Graces by God’s Servant’s Intercession

God, who created man in your image and intended him to share your glory, we thank you for having granted to your Church the gift of professor & doctor, Jerome Lejeune, MD, a distinguished Servant of Life. He knew how to place his immense intelligence and deep faith at the service of the defense of human life, especially unborn life, always seeking to treat and to cure.

A passionate witness to truth and charity, he knew how to reconcile faith and reason in the sight of today’s world. By his intercession, and according to Your will, we ask You to grant us the graces we implore, hoping that he will soon become one of your saints.

Amen.

Venerable Servant of Life!!!! Dr. Jerome Lejeune, MD, pray for us!!!!

Love,
Matthew

UPDATE: On January 21, 2021 Pope Francis authorized the Congregation for the Causes of Saints to promulgate a decree concerning the heroic virtues of Lejeune. He now will be referred to as Venerable Jérôme Lejeune.

Aude Dugast is the Paris-based postulator of the cause of canonization of Jérôme Lejeune. Dugast did not know Lejeune personally, though she admitted that he might have spoken at her university when she was growing up in Paris. She went to work at the Jérôme Lejeune Foundation in the French capital, then becoming vice postulator of the sainthood cause in 2007 and postulator in 2012. She oversaw the examination of his writings and coordinated the taking of testimony by those who knew him. Finally, she wrote the positio, a 1,000-page document detailing Lejeune’s life and virtues in support of his canonization.

“For me the main thing is his faith and his charity — a very strong and beautiful faith,” she said. “He never had doubts. He was a famous scientist, a genius, but he never saw any conflict between faith and science. Science helped him know creation, and faith helped him understand creation and to understand God. He showed there is no contradiction between these two kinds of knowledge.”

The profession in which Lejeune worked very often would pit intelligence against faith, but “he was the opposite,” Dugast said.

His other strong quality was his “incredible charity,” she attested. “He loved his patients. There were so many mothers who said they were very moved when they met him the first time and Lejeune looked at their son or daughter, and they saw that he looked at them with so much love in their eyes that they were very surprised, because he was a very famous professor. They were afraid to come with their child to this hospital, … but it was the first time they saw someone who was full of love for the child, and each time it was a new start for the family.”

He stood with science

Lejeune was born in 1926 in the Paris suburb of Montrouge. He studied medicine, then became a researcher at the National Center for Scientific Research in 1952. In July 1958, assisted by Marthe Gautier, he established a link between a state of mental debility and a chromosomal aberration, by the presence of an extra chromosome on the 21st pair, thus discovering trisomy 21.

This caused a revolution in the thinking of the time. As Jason Jones and John Zmirak have written, the families of Down syndrome children for decades had lived under a false moral stigma, since it was widely believed that the child’s “retardation” was the side-effect of syphilis in the mother, which was associated in the popular mind with prostitution.

“By offering rock-solid proof of a biological cause for Down syndrome, Lejeune helped the parents of such children move in from out of the shadows,” Jones and Zmirak wrote. But he didn’t stop there, as they documented:

Lejeune went on to uncover the genetic basis for another devastating birth defect, Cri-du-Chat Syndrome, and made advances in understanding the causes of Fragile-X Syndrome. He also anticipated the rest of medical science by decades in his insistence on the importance of folic acid in reducing the risk of many birth defects.

Dugast concluded, “I think this love for the patient is really the explanation of all his life.He could have worked on so many other subjects — math, physics — and sometimes he wanted to do that. He would write in his diary, ‘Every time I wanted to work on something else, I had a mother or a patient who told me, Professor, we need you to find a treatment.’ And so he always decided, ‘I can’t go away to other things, because my patients need me.’”

Prophet in his own profession

To his horror, Lejeune’s research began to be used for purposes he disapproved of, such as early detection of trisomy 21 in embryos, leading to their abortion. He decided to publicly defend Down children by fighting against abortion.

“He could do no other than defend his patients,” Dugast said. “He knew they can’t defend themselves.”

And this is where his living out the virtues in a heroic way — a key element in the Church’s decision on whether or not someone can be declared a saint — is so evident for Dugast. Lejeune could have quietly continued in his research and his treatment of patients, without participating in abortion himself. But he felt compelled to speak out, even at the risk of being shunned by the profession.

“The main example for me is when he went to San Francisco in 1969 to receive the Allan Award,” said Dugast, referring to the William Allan Memorial Award of the American Society of Human Genetics. The award ceremony would include a major speech by the recipient, and Lejeune knew that his audience would include “the most important geneticists in the world,” she said.

“He decided that day to say clearly that medicine had to decide if it wanted to kill or cure,” the postulator said. “He knew that in doing that he could lose everything. But he felt that maybe there was an opportunity for these geneticists to change their mind.”

In fact, it has been widely reported that Lejeune later told his wife, “Today, I lost my Nobel Prize in medicine.”

“It was very courageous, and for me it was really the first heroic decision, because he could have decided to be a very ethical physician, never do abortions or anything against his patients, but without talking, without saying anything, without having any program. But he knew he had to speak out. The danger for him was not to not do abortions, but to talk and to tell the truth.”

A year or two after the Allan lecture, it was evident that Lejeune had become almost a persona non grata.

“He didn’t get invitations to any scientific congresses,” Dugast said. “Before this he was the geneticist everyone wanted to invite.”

But he wasn’t totally out in the cold. Pope St. Paul VI appointed him to the Pontifical Academy of Sciences in 1974. He was also a member of the French Academy of Moral and Political Sciences, and of the Academy of Medicine.

Appointed by Pope St. John Paul II in February 1994 to head the new Pontifical Academy for Life, Lejeune died two months later, on April 3, which was Easter Sunday that year.

Today the Jérôme Lejeune Foundation continues its work of care and research, in France, Spain and the United States.

Jun 20 – Msgr Georges LeMaitre, (1894-1966), Priest, Physicist, Father of the “Big Bang” Theory

Not a saint, yet, but a personal and professional hero of mine.

Lemaitre

Monsignor Georges Henri Joseph Édouard Lemaître (July 17, 1894 – June 20, 1966) was a Belgian Roman Catholic priest, honorary prelate, professor of physics and astronomer at the Catholic University of Leuven.

Lemaître proposed what became known as the Big Bang theory of the origin of the Universe, which he called his ‘hypothesis of the primeval atom’.

Lemaitre was a pioneer in applying Einstein’s theory of general relativity to cosmology. He introduced the theoretical Hubble’s law in 1927 as a generic phenomena in relativistic cosmology. In 1931, he published his primeval atom theory in Nature. At the time, Einstein had expressed skepticism about Lemaître’s 1927 paper.

But it is Lemaître’s theory that changed the course of science.  Lemaître worked with astronomers and designed his theory to explain the observed redshift of galaxies, have testable implications, the linear relation beween distances and velocities, and to be in accord with observations of the time.

Lemaître proposed his theory at an opportune time, since Edwin Hubble would soon publish his velocity-distance relation that strongly supported an expanding universe and, consequently, the Big Bang theory. In fact, Lemaître’s 1927 paper derived what became known as Hubble’s Law, two years before Hubble did so, and provided an estimate of the numerical value of the constant. However, the data used by Lemaitre do not allow him to prove that there was an actual linear relation, a result achieved by Hubble.

Because Lemaître spent his entire career in Europe, his contributions are not as well known in the United States (USA) as those of Hubble or Einstein, men well known in the USA by virtue of residing there.

Lemaître recognized expanding solutions within relativistic cosmologies. Lemaître is the first one to propose that the expansion is the explanation for the redshift of galaxies. He further concluded that an initial “creation-like” event must have occurred.

Einstein at first dismissed, privately, Lemaître out of hand, saying that not all mathematics leads to correct theories. After Hubble’s discovery was published, Einstein quickly and publicly endorsed Lemaître’s theory, helping both the theory and its proposer get fast recognition.

georges_lemaitre

In 1933, Lemaître found an important inhomogeneous solution of Einstein’s field equations describing a spherical dust cloud, the Lemaitre-Tolman metric.

At the end of his life, he was devoted more and more to numerical calculation. He was in fact a remarkable algebraicist and arithmetical calculator. Since 1930, he used the most powerful calculating machines of the time like the Mercedes. In 1958, he introduced at the University a Burroughs E 101, the University’s first electronic computer. Lemaître kept a strong interest in the development of computers and, even more, in the problems of language and programming. This interest grew with age until it absorbed him almost completely.

In 1951 Pope Pius XII took the position that the scientific theory of the Big Bang confirmed the biblical creation story. This apparently caused great embarrassment, even to horror, for Lemaitre, who met with the Pope very soon after to caution the Holy Father on drawing parallels between a scientific theory and the book of Genesis.  The Pope appointed LeMaitre to the Pontifical Academy of the Sciences.  John XXIII made him its president.

Georges LeMaitre, after having received numerous scientific awards in the latter part of his career for his work, died on June 20, 1966, shortly after having learned of the discovery of cosmic microwave background radiation, which provided further evidence for his intuitions about the birth of the Universe.

“We can compare space-time to an open, conic cup…The bottom of the cup is the origin of atomic disintegration; it is the first instant at the bottom of space-time, the now which has no yesterday because, yesterday, there was no space.”
-Msgr Georges LeMaitre, The Primeval Atom

quote-scientific-progress-is-the-discovery-of-a-more-and-more-comprehensive-simplicity-the-georges-lemaitre-58-48-96

Technically yours, 🙂
Matthew

Roman Catholic cleric-scientists/engineers


-Nicolaus Copernicus

A
José de Acosta (1539–1600) – Jesuit missionary and naturalist who wrote one of the first detailed and realistic descriptions of the new world
François d’Aguilon (1567–1617) – Belgian Jesuit mathematician, architect, and physicist, who worked on optics
Lorenzo Albacete (1941–2014) – priest, physicist, and theologian
Albert of Castile (c. 1460-1522) – Dominican priest and historian.
Albert of Saxony (philosopher) (c. 1320–1390) – German bishop known for his contributions to logic and physics; with Buridan he helped develop the theory that was a precursor to the modern theory of inertia
Albertus Magnus (c. 1206–1280) – Dominican friar and Bishop of Regensburg who has been described as “one of the most famous precursors of modern science in the High Middle Ages.”Patron saint of natural sciences; Works in physics, logic, metaphysics, biology, and psychology.
Giulio Alenio (1582–1649) – Jesuit theologian, astronomer and mathematician; was sent to the Far East as a missionary and adopted a Chinese name and customs; wrote 25 books, including a cosmography and a Life of Jesus in Chinese.
José María Algué (1856–1930) – priest and meteorologist who invented the barocyclonometer
José Antonio de Alzate y Ramírez (1737–1799) – priest, scientist, historian, cartographer, and meteorologist who wrote more than thirty treatises on a variety of scientific subjects
Francesco Castracane degli Antelminelli (1817–1899) – priest and botanist who was one of the first to introduce microphotography into the study of biology
Giovanni Antonelli (1818–1872) – priest and astronomer who served as director of the Ximenian Observatory of Florence
Luís Archer (1926-2011) – Portuguese molecular biologist and editor of the journal Brotéria from 1962 to 2002
Nicolò Arrighetti (1709–1767) – Jesuit who wrote treatises on light, heat, and electricity
Mariano Artigas (1938–2006) – Spanish physicist, philosopher and theologian
Giuseppe Asclepi (1706–1776) – Jesuit astronomer and physician who served as director of the Collegio Romano observatory; the lunar crater Asclepi is named after him
B
Roger Bacon (c. 1214–1294) – Franciscan friar who made significant contributions to mathematics and optics and has been described as a forerunner of modern scientific method
Bernardino Baldi (1533–1617) – abbot, mathematician, and writer
Eugenio Barsanti (1821–1864) – Piarist, possible inventor of the internal combustion engine
Bartholomeus Amicus (1562–1649) – Jesuit, wrote on philosophy, mathematics, astronomy, and the concept of vacuum and its relationship with God
Daniello Bartoli (1608–1685) – Bartoli and fellow Jesuit astronomer Niccolò Zucchi are credited as probably having been the first to see the equatorial belts on the planet Jupiter
Joseph Bayma (1816–1892) – Jesuit known for work in stereochemistry and mathematics
Giacopo Belgrado (1704–1789) – Jesuit professor of mathematics and physics and court mathematician who did experimental work in electricity
Michel Benoist (1715–1774) – missionary to China and scientist
Mario Bettinus (1582–1657) – Jesuit philosopher, mathematician and astronomer; lunar crater Bettinus named after him
Giuseppe Biancani (1566–1624) – Jesuit astronomer, mathematician, and selenographer, after whom the crater Blancanus on the Moon is named
Jacques de Billy (1602–1679) – Jesuit who has produced a number of results in number theory which have been named after him; published several astronomical tables; the crater Billy on the Moon is named after him
Paolo Boccone (1633–1704) – Cistercian botanist who contributed to the fields of medicine and toxicology
Bernard Bolzano (1781–1848) – priest, mathematician, and logician whose other interests included metaphysics, ideas, sensation, and truth
Anselmus de Boodt (1550–1632) – Canon who was one of the founders of mineralogy
Theodoric Borgognoni (1205–1298) – Dominican friar, Bishop of Cervia, and medieval Surgeon who made important contributions to antiseptic practice and anaesthetics
Christopher Borrus (1583–1632) – Jesuit mathematician and astronomy who made observations on the magnetic variation of the compass
Roger Joseph Boscovich (1711–1787) – Jesuit polymath known for his contributions to modern atomic theory and astronomy and for devising perhaps the first geometric procedure for determining the equator of a rotating planet from three observations of a surface feature and for computing the orbit of a planet from three observations of its position
Joachim Bouvet (1656–1730) – Jesuit sinologist and cartographer who did his work in China
Michał Boym (c. 1612–1659) – Jesuit who was one of the first westerners to travel within the Chinese mainland, and the author of numerous works on Asian fauna, flora and geography
Thomas Bradwardine (c. 1290–1349) – Archbishop of Canterbury and mathematician who helped develop the mean speed theorem; one of the Oxford Calculators
Martin Stanislaus Brennan (1845–1927) – priest and astronomer who wrote several books about science
Henri Breuil (1877–1961) – priest, archaeologist, anthropologist, ethnologist and geologist
Jan Brożek (1585–1652) – Polish canon, polymath, mathematician, astronomer, and physician; the most prominent Polish mathematician of the 17th century
Louis-Ovide Brunet (1826–1876) – priest, one of the founding fathers of Canadian botany
Ismaël Bullialdus (1605–1694) – priest, astronomer, and member of the Royal Society; the Bullialdus crater is named in his honor
Jean Buridan (c. 1300 – after 1358) – priest who formulated early ideas of momentum and inertial motion and sowed the seeds of the Copernican revolution in Europe
Roberto Busa (1913–2011) – Jesuit, wrote a lemmatization of the complete works of St. Thomas Aquinas (Index Thomisticus) which was later digitalized by IBM

C
Niccolò Cabeo (1586–1650) – Jesuit mathematician; the crater Cabeus is named in his honor
Nicholas Callan (1799–1846) – priest and Irish scientist best known for his work on the induction coil
John Cantius (1390–1473) – priest and Buridanist mathematical physicist who further developed the theory of impetus
Jean Baptiste Carnoy (1836–1899) – priest, has been called the founder of the science of cytology[16]
Giovanni di Casali (died c. 1375) – Franciscan friar who provided a graphical analysis of the motion of accelerated bodies
Paolo Casati (1617–1707) – Jesuit mathematician who wrote on astronomy, meteorology, and vacuums; the crater Casatus on the Moon is named after him; published Terra machinis mota (1658), a dialogue between Galileo, Paul Guldin and father Marin Mersenne on cosmology, geography, astronomy and geodesy, giving a positive image of Galileo 25 years after his conviction.
Laurent Cassegrain (1629–1693) – priest who was the probable namesake of the Cassegrain telescope; the crater Cassegrain on the Moon is named after him
Louis Bertrand Castel (1688-1757) – French Jesuit physicist who worked on gravity and optics in a Cartesian context
Benedetto Castelli (1578–1643) – Benedictine mathematician; long-time friend and supporter of Galileo Galilei, who was his teacher; wrote an important work on fluids in motion
Bonaventura Cavalieri (1598–1647) – Jesuate (not to be confused with Jesuit) known for his work on the problems of optics and motion, work on the precursors of infinitesimal calculus, and the introduction of logarithms to Italy; his principle in geometry partially anticipated integral calculus; the lunar crater Cavalerius is named in his honor
Antonio José Cavanilles (1745–1804) – priest and leading Spanish taxonomic botanist of the 18th century
Francesco Cetti (1726–1778) – Jesuit zoologist and mathematician
Tommaso Ceva (1648–1737) – Jesuit mathematician, poet, and professor who wrote treatises on geometry, gravity, and arithmetic
Christopher Clavius (1538–1612) – German mathematician and astronomer, most noted in connection with the Gregorian calendar, his arithmetic books were used by many mathematicians including Leibniz and Descartes
Guy Consolmagno (1952–) – Jesuit astronomer and planetary scientist, serving as Director of the Vatican Observatory
Nicolaus Copernicus (1473–1543) – Renaissance astronomer and canon famous for his heliocentric cosmology that set in motion the Copernican Revolution
Vincenzo Coronelli (1650–1718) – Franciscan cosmographer, cartographer, encyclopedist, and globe-maker
Bonaventura Corti (1729-1813) – Italian biologist and physicist who made microscopic observations on Tremels, Rotifers and seaweeds
George Coyne (1933–) – Jesuit astronomer and former director of the Vatican Observatory whose research interests have been in polarimetric studies of various subjects, including Seyfert galaxies
James Cullen (mathematician) (1867–1933) – Jesuit mathematician who published what is now known as Cullen numbers in number theory
James Curley (astronomer) (1796–1889) – Jesuit, first director of Georgetown Observatory and determined the latitude and longitude of Washington, D.C.
Albert Curtz (1600–1671) – Jesuit astronomer who expanded on the works of Tycho Brahe and contributed to early understanding of the moon; the crater Curtius on the Moon is named after him
Johann Baptist Cysat (1587–1657) – Jesuit mathematician and astronomer, after whom the lunar crater Cysatus is named; published the first printed European book concerning Japan; one of the first to make use of the newly developed telescope; did important research on comets and the Orion nebula
Jean-Baptiste Chappe d’Auteroche (1722–1769) – priest and astronomer best known for his observations of the transits of Venus
D
Ignazio Danti (1536–1586) – Dominican mathematician, astronomer, cosmographer, and cartographer
Armand David (1826–1900) – Lazarist priest, zoologist, and botanist who did important work in these fields in China
Francesco Denza (1834–1894) – Barnabite meteorologist, astronomer, and director of Vatican Observatory
Václav Prokop Diviš (1698–1765) – Czech priest who studied electrical phenomenons and constructed, among other inventions, the first electrified musical instrument in history
Alberto Dou Mas de Xaxàs (1915–2009) – Spanish Jesuit priest who was president of the Royal Society of Mathematics, member of the Royal Academy of Natural, Physical, and Exact Sciences, and one of the foremost mathematicians of his country
Johann Dzierzon (1811–1906) – priest and pioneering apiarist who discovered the phenomenon of parthenogenesis among bees, and designed the first successful movable-frame beehive; has been described as the “father of modern apiculture”
F
Francesco Faà di Bruno (c. 1825–1888) – priest and mathematician beatified by Pope John Paul II
Honoré Fabri (1607–1688) – Jesuit mathematician and physicist
Jean-Charles de la Faille (1597–1652) – Jesuit mathematician who determined the center of gravity of the sector of a circle for the first time
Gabriele Falloppio (1523–1562) – Canon and one of the most important anatomists and physicians of the sixteenth century; the Fallopian tubes, which extend from the uterus to the ovaries, are named for him
Gyula Fényi (1845–1927) – Jesuit astronomer and director of the Haynald Observatory; noted for his observations of the sun; the crater Fényi on the Moon is named after him
Louis Feuillée (1660–1732) – Minim explorer, astronomer, geographer, and botanist
Kevin T. FitzGerald (1955-) – American molecular biologist and holds the Dr. David Lauler chair in Catholic Health Care Ethics at Georgetown University
Placidus Fixlmillner (1721–1791) – Benedictine priest and one of the first astronomers to compute the orbit of Uranus
Paolo Frisi (1728–1784) – priest, mathematician, and astronomer who did significant work in hydraulics
José Gabriel Funes (1963– ) – Jesuit astronomer and former director of the Vatican Observatory
Lorenzo Fazzini (1787–1837) – priest and physicist born in Vieste and worked in Naples, Italy

G
Joseph Galien (1699 – c. 1762) – Dominican professor who wrote on aeronautics, hailstorms, and airships
Jean Gallois (1632–1707) – French scholar, abbot, and member of Académie des Sciences
Pierre Gassendi (1592–1655) – French priest, astronomer, and mathematician who published the first data on the transit of Mercury; best known intellectual project attempted to reconcile Epicurean atomism with Christianity
Antoine Gaubil (1689-1759) – French astronomer who was the director general of the College of Interpreters at the court of China between 1741 and 1759 and centralized information provided by the Jesuit observatories throughout the world
Agostino Gemelli (1878–1959) – Franciscan physician and psychologist; founded Catholic University of the Sacred Heart in Milan
Johannes von Gmunden (c. 1380–1442) – Canon, mathematician, and astronomer who compiled astronomical tables; Asteroid 15955 Johannesgmunden named in his honor
Carlos de Sigüenza y Góngora (1645–1700) – priest, polymath, mathematician, astronomer, and cartographer; drew the first map of all of New Spain
Andrew Gordon (1712–1751) – Benedictine monk, physicist, and inventor who made the first electric motor
Christoph Grienberger (1561–1636) – Jesuit astronomer after whom the crater Gruemberger on the Moon is named; verified Galileo’s discovery of Jupiter’s moons.
Francesco Maria Grimaldi (1618–1663) – Jesuit who discovered the diffraction of light (indeed coined the term “diffraction”), investigated the free fall of objects, and built and used instruments to measure geological features on the moon
Robert Grosseteste (c. 1175 – 1253) – bishop who was one of the most knowledgeable men of the Middle Ages; has been called “the first man ever to write down a complete set of steps for performing a scientific experiment”[17]
Paul Guldin (1577–1643) – Jesuit mathematician and astronomer who discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution
Bartolomeu de Gusmão (1685–1724) – Jesuit known for his early work on lighter-than-air airship design
H
Johann Georg Hagen (1847–1930) – Jesuit director of the Georgetown and Vatican Observatories; the crater Hagen on the Moon is named after him
Frank Haig (1928-) – American physics professor
Nicholas Halma (1755–1828) – French abbot, mathematician, and translator
Jean-Baptiste du Hamel (1624–1706) – French priest, natural philosopher, and secretary of the Academie Royale des Sciences
René Just Haüy (1743–1822) – priest known as the father of crystallography
Maximilian Hell (1720–1792) – Jesuit astronomer and director of the Vienna Observatory who wrote astronomy tables and observed the Transit of Venus; the crater Hell on the Moon is named after him
Michał Heller (1936– ) – Polish priest, Templeton Prize winner, and prolific writer on numerous scientific topics
Lorenz Hengler (1806–1858) – priest often credited as the inventor of the horizontal pendulum
Hermann of Reichenau (1013–1054) – Benedictine historian, music theorist, astronomer, and mathematician
Pierre Marie Heude (1836–1902) – Jesuit missionary and zoologist who studied the natural history of Eastern Asia
Franz von Paula Hladnik (1773–1844) – priest and botanist who discovered several new kinds of plants, and certain genera have been named after him
Giovanni Battista Hodierna (1597–1660) – priest and astronomer who catalogued nebulous objects and developed an early microscope
Johann Baptiste Horvath (1732-1799) – Hungarian physicist who taught physics and philosophy at the University of Tyrnau, later of Buda, and wrote many Newtonian textbooks
Victor-Alphonse Huard (1853–1929) – priest, naturalist, educator, writer, and promoter of the natural sciences
I
Maximus von Imhof (1758–1817) – German Augustinian physicist and director of the Munich Academy of Sciences
Giovanni Inghirami (1779–1851) – Italian Piarist astronomer who has a valley on the moon named after him as well as a crater
J
François Jacquier (1711–1788) – Franciscan mathematician and physicist; at his death he was connected with nearly all the great scientific and literary societies of Europe
Stanley Jaki (1924–2009) – Benedictine priest and prolific writer who wrote on the relationship between science and theology
Ányos Jedlik (1800–1895) – Benedictine engineer, physicist, and inventor; considered by Hungarians and Slovaks to be the unsung father of the dynamo and electric motor

K
Georg Joseph Kamel (1661–1706) – Jesuit missionary and botanist who established the first pharmacy in the Philippines; the genus Camellia is named for him
Karl Kehrle (1898–1996) – Benedictine Monk of Buckfast Abbey, England; beekeeper; world authority on bee breeding, developer of the Buckfast bee
Eusebio Kino (1645–1711) – Jesuit missionary, mathematician, astronomer and cartographer; drew maps based on his explorations first showing that California was not an island, as then believed; published an astronomical treatise in Mexico City of his observations of the Kirsch comet
Otto Kippes (1905–1994) – priest acknowledged for his work in asteroid orbit calculations; the main belt asteroid 1780 Kippes was named in his honour
Athanasius Kircher (1602–1680) – Jesuit who has been called the father of Egyptology and “Master of a hundred arts”; wrote an encyclopedia of China; one of the first people to observe microbes through a microscope; in his Scrutinium Pestis of 1658 he noted the presence of “little worms” or “animalcules” in the blood, and concluded that the disease was caused by micro-organisms; this is antecedent to germ theory
Wenceslas Pantaleon Kirwitzer (1588–1626) – Jesuit astronomer and missionary to China who published observations of comets
Jan Krzysztof Kluk (1739–1796) – priest, naturalist agronomist, and entomologist who wrote a multi-volume work on Polish animal life
Marian Wolfgang Koller (1792–1866) – Benedictine professor who wrote on astronomy, physics, and meteorology
Franz Xaver Kugler (1862–1929) – Jesuit chemist, mathematician, and Assyriologist who is most noted for his studies of cuneiform tablets and Babylonian astronomy
L
Ramon Llull (ca. 1232 – ca. 1315) – Majorcan writer and philosopher, logician and a Franciscan tertiary considered a pioneer of computation theory
Nicolas Louis de Lacaille (1713–1762) – French deacon and astronomer noted for cataloguing stars, nebulous objects, and constellations
Eugene Lafont (1837–1908) – Jesuit physicist, astronomer, and founder of the first Scientific Society in India
Antoine de Laloubère (1600–1664) – Jesuit and first mathematician to study the properties of the helix
Bernard Lamy (1640–1715) – Oratorian philosopher and mathematician who wrote on the parallelogram of forces
Roberto Landell de Moura (1861–1928) – priest and inventor who was the first to accomplish the transmission of the human voice by a wireless machine
Pierre André Latreille (1762–1833) – priest and entomologist whose works describing insects assigned many of the insect taxa still in use today
Georges Lemaître (1894–1966) – Belgian priest and father of the Big Bang theory
Émile Licent (1876–1952) – French Jesuit trained as a natural historian; spent more than 25 years researching in Tianjin, China
Joseph Xaver Liesganig (1719-1799) – Austrian astronomer and geodesist who managed the Jesuit observatory in Vienna between 1756 and 1773
Thomas Linacre (c. 1460–1524) – English priest, humanist, translator, and physician
Francis Line (1595–1675) – Jesuit magnetic clock and sundial maker who disagreed with some of the findings of Newton and Boyle
Juan Caramuel y Lobkowitz (1606–1682) – Cistercian who wrote on a variety of scientific subjects, including probability theory
João de Loureiro (1717–1791) – Portuguese mathematician and botanist active in Cochinchina

M
Jean Mabillon (1632–1707) – Benedictine monk and scholar, considered the founder of palaeography and diplomatics
James B. Macelwane (1883–1956) – Jesuit seismologist who contributed a volume to the first textbook on seismology in America
John MacEnery (1797–1841) – archaeologist who investigated the Palaeolithic remains at Kents Cavern
Manuel Magri (1851–1907) – Jesuit ethnographer, archaeologist and writer; one of Malta’s pioneers in archaeology
Emmanuel Maignan (1601–1676) – Minim physicist and professor of medicine who published works on gnomonics and perspective
Pal Mako (1724-1793) – Hungarian mathematician and physicist who taught mathematics, experimental physics and mechanics at the Vienna Theresianum and had a part in the preparation of the Ratio educationis (1777), which reformed the imperial teaching system in the spirit of Enlightenment
Charles Malapert (1581–1630) – Jesuit writer, astronomer, and proponent of Aristotelian cosmology; also known for observations of sunpots, the lunar surface, and the southern sky; the crater Malapert on the Moon is named after him
Nicolas Malebranche (1638–1715) – Oratorian philosopher who studied physics, optics, and the laws of motion and disseminated the ideas of Descartes and Leibniz
Marcin of Urzędów (c. 1500–1573) – priest, physician, pharmacist, and botanist
Joseph Maréchal (1878–1944) – Jesuit philosopher and psychologist
Marie-Victorin (1885–1944) – Christian Brother and botanist best known as the father of the Jardin botanique de Montréal
Edme Mariotte (c. 1620–1684) – priest and physicist who recognized Boyle’s Law and wrote about the nature of color
Francesco Maurolico (1494–1575) – Benedictine who made contributions to the fields of geometry, optics, conics, mechanics, music, and astronomy, and gave the first known proof by mathematical induction
Christian Mayer (astronomer) (1719–1783) – Jesuit astronomer most noted for pioneering the study of binary stars
James Robert McConnell (1915–1999) – Irish theoretical physicist, pontifical academician, Monsignor
Michael C. McFarland (1948-) – American computer scientist and president of the College of the Holy Cross in Worcester, Massachusetts
Paul McNally (1890–1955) – Jesuit astronomer and director of Georgetown Observatory; the crater McNally on the Moon is named after him
Gregor Mendel (1822–1884) – Augustinian monk and father of genetics
Pietro Mengoli (1626–1686) – priest and mathematician who first posed the famous Basel Problem
Giuseppe Mercalli (1850–1914) – priest, volcanologist, and director of the Vesuvius Observatory who is best remembered today for his Mercalli scale for measuring earthquakes which is still in use
Marin Mersenne (1588–1648) – Minim philosopher, mathematician, and music theorist, so-called “father of acoustics”
Paul of Middelburg (1446–1534) – Bishop who wrote on the reform of the calendar
Maciej Miechowita (1457–1523) – Canon who wrote the first accurate geographical and ethnographical description of Eastern Europe, as well as two medical treatises
François-Napoléon-Marie Moigno (1804–1884) – Jesuit physicist and mathematician; was an expositor of science and translator rather than an original investigator
Juan Ignacio Molina (1740–1829) – Jesuit naturalist, historian, botanist, ornithologist and geographer
Louis Moréri (1643–1680) – 17th-century priest and encyclopaedist
Theodorus Moretus (1602–1667) – Jesuit mathematician and author of the first mathematical dissertations ever defended in Prague; the lunar crater Moretus is named after him
Gabriel Mouton (1618–1694) – abbot, mathematician, astronomer, and early proponent of the metric system
Jozef Murgaš (1864–1929) – priest who contributed to wireless telegraphy and helped develop mobile communications and wireless transmission of information and human voice
José Celestino Mutis (1732–1808) – Canon, botanist, and mathematician who led the Royal Botanical Expedition of the New World
N
Bienvenido Nebres (1940-) – Filipino mathematician, president of Ateneo de Manila University, and an honoree of the National Scientist of the Philippines award
Jean François Niceron (1613–1646) – Minim mathematician who studied geometrical optics
Nicholas of Cusa (1401–1464) – Cardinal, philosopher, jurist, mathematician, astronomer, and one of the great geniuses and polymaths of the 15th century
Julius Nieuwland (1878–1936) – Holy Cross priest, known for his contributions to acetylene research and its use as the basis for one type of synthetic rubber, which eventually led to the invention of neoprene by DuPont
Jean-Antoine Nollet (1700–1770) – abbot and physicist who discovered the phenomenon of osmosis in natural membranes

O
Hugo Obermaier (1877–1946) – priest, prehistorian, and anthropologist who is known for his work on the diffusion of mankind in Europe during the Ice Age, as well as his work with north Spanish cave art
William of Ockham (c. 1288 – c. 1348) – Franciscan Scholastic who wrote significant works on logic, physics, and theology; known for Occam’s razor-principle
Nicole Oresme (c. 1323–1382) – one of the most famous and influential philosophers of the later Middle Ages; economist, mathematician, physicist, astronomer, philosopher, theologian and Bishop of Lisieux, and competent translator; one of the most original thinkers of the 14th century
Barnaba Oriani (1752–1832) – Barnabite geodesist, astronomer and scientist whose greatest achievement was his detailed research of the planet Uranus; also known for Oriani’s theorem
P
Tadeusz Pacholczyk (1965–) – priest, neuroscientist and writer
Luca Pacioli (c. 1446–1517) – Franciscan friar who published several works on mathematics; often regarded as the “father of accounting”
Ignace-Gaston Pardies (1636–1673) – Jesuit physicist known for his correspondence with Newton and Descartes
Franciscus Patricius (1529–1597) – priest, cosmic theorist, philosopher, and Renaissance scholar
John Peckham (1230–1292) – Archbishop of Canterbury and early practitioner of experimental science
Nicolas Claude Fabri de Peiresc (1580–1637) – abbot and astromer who discovered the Orion Nebula; lunar crater Peirescius named in his honor
Stephen Joseph Perry (1833–1889) – Jesuit astronomer and Fellow of the Royal Society; made frequent observations of Jupiter’s satellites, of stellar occultations, of comets, of meteorites, of sun spots, and faculae
Giambattista Pianciani (1784–1862) – Jesuit mathematician and physicist who established the electric nature of aurora borealis
Giuseppe Piazzi (1746–1826) – Theatine mathematician and astronomer who discovered Ceres, today known as the largest member of the asteroid belt; also did important work cataloguing stars
Jean Picard (1620–1682) – priest and first person to measure the size of the Earth to a reasonable degree of accuracy; also developed what became the standard method for measuring the right ascension of a celestial object; the PICARD mission, an orbiting solar observatory, is named in his honor
Edward Pigot (1858–1929) – Jesuit seismologist and astronomer
Alexandre Guy Pingré (1711–1796) – French priest astronomer and naval geographer; the crater Pingré on the Moon is named after him, as is the asteroid 12719 Pingré
Andrew Pinsent (1966–) – priest whose current research includes the application of insights from autism and social cognition to ‘second-person’ accounts of moral perception and character formation; his previous scientific research contributed to the DELPHI experiment at CERN
Jean Baptiste François Pitra (1812–1889) – Benedictine cardinal, archaeologist and theologian who noteworthy for his great archaeological discoveries
Charles Plumier (1646–1704) – Minim friar who is considered one of the most important botanical explorers of his time
Marcin Odlanicki Poczobutt (1728–1810) – Jesuit astronomer and mathematician; granted the title of the King’s Astronomer; the crater Poczobutt on the Moon is named after him; taught astronomy at Vilna University (1764-1808), managed its observatory and was the rector of Vilna University between 1777 and 1808
Léon Abel Provancher (1820–1892) – priest and naturalist devoted to the study and description of the fauna and flora of Canada; his pioneer work won for him the appellation of the “father of natural history in Canada”

Astronomer Georges Lemaitre (right) speaks with Albert Einstein after a talk in Pasadena, Calif., in 1932. Lemaitre first published a paper on the expansion of the universe in 1927, but it ran in a minor French scientific journal. The study was republished in 1931, but with key sections missing; a recently found letter indicates it was Lemaitre himself who made the edits.

R
Claude Rabuel (1669–1729) – Jesuit mathematician who analyzed Descartes’s Géométrie
Louis Receveur (1757–1788) – Franciscan naturalist and astronomer; described as being as close as one could get to being an ecologist in the 18th century
Franz Reinzer (1661–1708) – Jesuit who wrote an in-depth meteorological, astrological, and political compendium covering topics such as comets, meteors, lightning, winds, fossils, metals, bodies of water, and subterranean treasures and secrets of the earth
Louis Rendu (1789–1859) – bishop who wrote an important book on the mechanisms of glacial motion; the Rendu Glacier, Alaska, US and Mount Rendu, Antarctica are named for him
Vincenzo Riccati (1707–1775) – Italian Jesuit mathematician and physicist
Matteo Ricci (1552–1610) – one of the founding fathers of the Jesuit China Mission and co-author of the first European-Chinese dictionary
Giovanni Battista Riccioli (1598–1671) – Jesuit astronomer who authored Almagestum novum, an influential encyclopedia of astronomy; the first person to measure the rate of acceleration of a freely falling body; created a selenograph with Father Grimaldi that now adorns the entrance at the National Air and Space Museum in Washington, D.C.; first to note that Mizar was a “double star”
Richard of Wallingford (1292–1336) – abbot, renowned clockmaker, and one of the initiators of western trigonometry
Lluis Rodés (1881-1939) – Spanish astronomer and director of Observatorio del Ebro, wrote El Frmamento
Johannes Ruysch (c. 1460–1533) – priest, explorer, cartographer, and astronomer who created the second oldest known printed representation of the New World
S
Giovanni Girolamo Saccheri (1667–1733) – Jesuit mathematician and geometer who was perhaps the first European to write about Non-Euclidean geometry
Johannes de Sacrobosco (c. 1195 – c. 1256) – Irish monk and astronomer who wrote the authoritative medieval astronomy text Tractatus de Sphaera; his Algorismus was the first text to introduce Hindu-Arabic numerals and procedures into the European university curriculum; the lunar crater Sacrobosco is named after him
Gregoire de Saint-Vincent (1584–1667) – Jesuit mathematician who made important contributions to the study of the hyperbola
Alphonse Antonio de Sarasa (1618–1667) – Jesuit mathematician who contributed to the understanding of logarithms
Christoph Scheiner (c. 1573–1650) – Jesuit physicist, astronomer, and inventor of the pantograph; wrote on a wide range of scientific subjects, including sunspots, leading to a dispute with Galileo Galilei
Wilhelm Schmidt (linguist) (1868–1954) – Austrian priest, linguist, anthropologist, and ethnologist
George Schoener (1864–1941) – priest who became known in the United States as the “Padre of the Roses” for his experiments in rose breeding
Gaspar Schott (1608–1666) – Jesuit physicist, astronomer, and natural philosopher who is most widely known for his works on hydraulic and mechanical instruments
Franz Paula von Schrank (1747–1835) – priest, botanist, entomologist, and prolific writer
Berthold Schwarz (c. 14th century) – Franciscan friar and reputed inventor of gunpowder and firearms
Anton Maria Schyrleus of Rheita (1604–1660) – Capuchin astronomer and optician who built Kepler’s telescope
George Mary Searle (1839–1918) – Paulist astronomer and professor who discovered six galaxies
Angelo Secchi (1818–1878) – Jesuit pioneer in astronomical spectroscopy and one of the first scientists to state authoritatively that the sun is a star; discovered the existence of solar spicules and drew an early map of Mars
Alessandro Serpieri (1823–1885) – priest, astronomer, and seismologist who studied shooting stars, and was the first to introduce the concept of the seismic radiant
Gerolamo Sersale (1584–1654) – Jesuit astronomer and selenographer; his map of the moon can be seen in the Naval Observatory of San Fernando; the lunar crater Sirsalis is named after him
Benedict Sestini (1816–1890) – Jesuit astronomer, mathematician and architect; studied sunspots and eclipses; wrote textbooks on a variety of mathematical subjects
René François Walter de Sluse (1622–1685) – Canon and mathematician with a family of curves named after him
Domingo de Soto (1494–1560) – Spanish Dominican priest and professor at the University of Salamanca; in his commentaries to Aristotle he proposed that free falling bodies undergo constant acceleration
Lazzaro Spallanzani (1729–1799) – priest, biologist, and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction, and essentially discovered echolocation; his research of biogenesis paved the way for the investigations of Louis Pasteur
Valentin Stansel (1621–1705) – Jesuit astronomer in Brazil, who discovered a comet, which, after accurate positions were made via F. de Gottignies in Goa, became known as the Estancel-Gottignies comet
Johan Stein (1871–1951) – Jesuit astronomer and director of the Vatican Observatory, which he modernized and relocated to Castel Gandolfo; the crater Stein on the far side of the Moon is named after him
Nicolas Steno (1638–1686) – Bishop beatified by Pope John Paul II who is often called the father of geology[18] and stratigraphy,[8] and is known for Steno’s principles
Joseph Stepling (1716-1778) – Bohemian astronomer, physicist and mathematician who managed the Jesuit observatory in Prague between 1751 and 1778
Pope Sylvester II (c. 946–1003) – Prolific scholar who endorsed and promoted Arabic knowledge of arithmetic, mathematics, and astronomy in Europe, reintroducing the abacus and armillary sphere which had been lost to Europe since the end of the Greco-Roman era
Alexius Sylvius Polonus (1593 – c. 1653) – Jesuit astronomer who studied sunspots and published a work on calendariography
Ignacije Szentmartony (1718–1793) – Jesuit cartographer and royal mathematician and astronomer, who became a member of the expedition that worked on the rearrangement of the frontiers among colonies in South America, especially Brazil

T
André Tacquet (1612–1660) – Jesuit mathematician whose work laid the groundwork for the eventual discovery of calculus
Pierre Teilhard de Chardin (1881–1955) – Jesuit paleontologist and geologist who took part in the discovery of Peking Man
Francesco Lana de Terzi (c. 1631–1687) – Jesuit referred to as the Father of Aviation[19] for his pioneering efforts; he also developed a blind writing alphabet prior to Braille.
Theodoric of Freiberg (c. 1250 – c. 1310) – Dominican theologian and physicist who gave the first correct geometrical analysis of the rainbow
Joseph Tiefenthaler (1710–1785) – Jesuit who was one of the earliest European geographers to write about India
Giuseppe Toaldo (1719–1797) – priest and physicist who studied atmospheric electricity and did important work with lightning rods; the asteroid 23685 Toaldo is named for him
José Torrubia (c. 1700–1768) – Franciscan linguist, scientist, collector of fossils and books, and writer on historical, political and religious subjects
Franz de Paula Triesnecker (1745–1817) – Jesuit astronomer and director of the Vienna Observatory; published a number of treatises on astronomy and geography; the crater Triesnecker on the Moon is named after him
V
Luca Valerio (1552–1618) – Jesuit mathematician who developed ways to find volumes and centers of gravity of solid bodies
Pierre Varignon (1654–1722) – priest and mathematician whose principle contributions were to statics and mechanics; created a mechanical explanation of gravitation
Jacques de Vaucanson (1709–1782) – French Minim friar inventor and artist who was responsible for the creation of impressive and innovative automata and machines such as the first completely automated loom
Giovanni Battista Venturi (1746–1822) – priest who discovered the Venturi effect
Fausto Veranzio (c. 1551–1617) – Bishop, polymath, inventor, and lexicographer
Ferdinand Verbiest (1623–1688) – Jesuit astronomer and mathematician; designed what some claim to be the first ever self-propelled vehicle, which many claim this as the world’s first automobile
Francesco de Vico (1805–1848) – Jesuit astronomer who discovered or co-discovered a number of comets; also made observations of Saturn and the gaps in its rings; the lunar crater De Vico and the asteroid 20103 de Vico are named after him
Vincent of Beauvais (c.1190–c.1264) – Dominican who wrote the most influential encyclopedia of the Middle Ages
Benito Vines (1837–1893) – Jesuit meteorologist known as “Father Hurricane” who made the first weather model to predict the trajectory of a hurricane[20][21][dead link][22]
János Vitéz (archbishop) (c.1405–1472) – Cardinal Archbishop of Esztergom, astronomer, and mathematician
Giovanni Serafino Volta (1764-1842) – Priest and paleontologist who wrote the first treatise on fossil ichthyology in Italy
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Martin Waldseemüller (c. 1470–1520) – German priest and cartographer who, along with Matthias Ringmann, is credited with the first recorded usage of the word America
Erich Wasmann (1859–1931) – Austrian entomologist known for Wasmannian mimicry
Godefroy Wendelin (1580–1667) – priest and astronomer who recognized that Kepler’s third law applied to the satellites of Jupiter; the lunar crater Vendelinus is named in his honor
Johannes Werner (1468–1522) – priest, mathematician, astronomer, and geographer
Witelo (c. 1230 – after 1280, before 1314) – Friar, physicist, natural philosopher, and mathematician; lunar crater Vitello named in his honor; his Perspectiva powerfully influenced later scientists, in particular Johannes Kepler
Julian Tenison Woods (1832–1889) – Passionist geologist and mineralogist
Theodor Wulf (1868–1946) – Jesuit physicist who was one of the first experimenters to detect excess atmospheric radiation
Franz Xaver von Wulfen (1728–1805) – Jesuit botanist, mineralogist, and alpinist
X
Leonardo Ximenes (1711-1786) – Italian physicist and astronomer, specialist of hydraulics, creator and director of the Observatory San Giovanino in Florence
Z
John Zahm (1851–1921) – Holy Cross priest and South American explorer
Giuseppe Zamboni (1776–1846) – priest and physicist who invented the Zamboni pile, an early electric battery similar to the Voltaic pile
Francesco Zantedeschi (1797–1873) – priest who was among the first to recognize the marked absorption by the atmosphere of red, yellow, and green light; published papers on the production of electric currents in closed circuits by the approach and withdrawal of a magnet, thereby anticipating Michael Faraday’s classical experiments of 1831[23]
Niccolò Zucchi (1586–1670) – claimed to have tried to build a reflecting telescope in 1616 but abandoned the idea (maybe due to the poor quality of the mirror);[24] may have been the first to see the belts on the planet Jupiter (1630)[25]
Giovanni Battista Zupi (c. 1590–1650) – Jesuit astronomer, mathematician, and first person to discover that the planet Mercury had orbital phases; the crater Zupus on the Moon is named after him