Short wikipedia list of some of those scientists who were openly atheistic
some really big names there...
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David Baltimore (1938—
: Professor of Biology at the California Institute of Technology. He won the Nobel Prize in Physiology or Medicine in 1975 for his work on the genetic mechanisms of viruses.[106]
* Paul D. Boyer (1918—
: American biochemist and Nobel Laureate in Chemistry in 1997.[107]
* Sean M. Carroll (1956—
: Theoretical cosmologist specializing in dark energy and general relativity.[108]
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Francis Crick (1916–2004): 1962-Nobel-laureate co-discoverer of the structure of DNA, who described himself as a skeptic and an agnostic with "a strong inclination towards atheism."[109][110]
* Marie Curie (1867–1934): Nobel Laureate in Physics (1903) and Chemistry (1911). First woman to be awarded a Nobel Prize, only person to win Nobel Prizes in two different scientific disciplines.[111]
* Richard Dawkins (1941—
: British zoologist, biologist, creator of the concepts of the selfish gene and the meme; outspoken atheist and popularizer of science, author of The God Delusion and founder of the Richard Dawkins Foundation for Reason and Science.[112]
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Richard Feynman (1918–1988): American 1965-Nobel-laureate theoretical physicist. [113]
* Sigmund Freud (1856–1939): Father of psychoanalysis.[114]
* Christer Fuglesang (1957—
, Swedish astronaut and physicist, identified as an atheist in a Dagens Nyheter interview.[115]
* Vitaly Ginzburg (1916—
: 2003 Nobel Laureate in Physics.[116]
* Alfred Kinsey (1894–1956): American biologist, sexologist and professor of entomology and zoology.[117]
* Frédéric Joliot-Curie (1900–1958): French physicist and Nobel Laureate in Chemistry in 1935.[118]
* Irène Joliot-Curie (1897–1956): French scientist, the daughter of Marie and Pierre Curie and the wife of Frédéric Joliot-Curie, and Nobel laureate in Chemistry in 1935.[119]
* Harold Kroto (1939—
: 1996 Nobel Laureate in Chemistry.[120]
* PZ Myers (1957—
American biology professor at the University of Minnesota and a science blogger via his blog, Pharyngula.[121]
* Richard Leakey (1944—
: Kenyan paleontologist, archaeologist and conservationist.[122]
* Ernst Mayr (1904–2005): a renowned taxonomist, tropical explorer, ornithologist, historian of science, and naturalist. He was one of the 20th century's leading evolutionary biologists.[123]
* Jonathan Miller (1934—
: British physician, actor, theatre and opera director, and (latterly) television presenter. Wrote and presented the 2004 television series, Atheism: A Rough History of Disbelief, exploring the roots of his own atheism and investigating the history of atheism in the world.[124]
* Peter D. Mitchell (1920–1992): 1978-Nobel-laureate British biochemist. Atheist mother, and himself atheist from age 15.[125]
* Paul Nurse (1949—
: 2001 Nobel Laureate in Physiology or Medicine.[126]
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Linus Pauling (1901–1994): Nobel Laureate in Chemistry (1954) and Peace (1962). He is also considered by many to be the greatest chemist of the 20th century.[127]
* Steven Pinker (1954—
: American psychologist.[128]
* Amartya Kumar Sen (1933—
: 1998 Nobel Laureate in Economics.[129][130][131][132]
* Claude Shannon (1916–2001): American electrical engineer and mathematician, has been called "the father of information theory", and was the founder of practical digital circuit design theory. [133]
* Michael Smith (1932–2000): British-born Canadian biochemist and Nobel Laureate in Chemistry in 1993.[134]
* Richard Stallman (1953—
: American software freedom activist, hacker, and software developer.[135]
* Linus Torvalds (1969—
: Finnish software engineer, creator of the Linux kernel. [136]
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James D. Watson (1928—
, 1962-Nobel-laureate co-discover of the structure of DNA, identified as an atheist in a Newsweek commentary by his acquaintance, Rabbi Marc Gellman.[137]
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Steven Weinberg (1933—
: 1979 Nobel Laureate in Physics.[138]