Zhores Alferov (1930–): Soviet and Russian physicist and academic who contributed significantly to the creation of modern heterostructure physics and electronics. He is an inventor of the heterotransistor and the winner of 2000 Nobel Prize in Physics.
Hannes Alfvén (1908–1995): Swedish electrical engineer and plasma physicist. He received the 1970 Nobel Prize in Physics for his work on magnetohydrodynamics (MHD). He is best known for describing the class of MHD waves now known as Alfvén waves.
Jim Al-Khalili (1962–): Iraqi-born British theoretical physicist, author and science communicator. He is professor of Theoretical Physics and Chair in the Public Engagement in Science at the University of Surrey.
Philip W. Anderson (1923-): American physicist. He was one of the recipients of the Nobel Prize in Physics in 1977. Anderson has made contributions to the theories of localization, antiferromagnetism and high-temperature superconductivity.
François Arago (1786–1853): French mathematician, physicist, astronomer and politician.
Svante Arrhenius (1859–1927): Swedish physicist and chemist. He is considered to be one of the founders of physical chemistry. He received the Nobel Prize in Chemistry in 1903.
Peter Atkins (1940–): English chemist, Professor of chemistry at Lincoln College, Oxford in England.
Julius Axelrod (1912–2004): American Nobel Prize winning biochemist, noted for his work on the release and reuptake of catecholamine neurotransmitters and major contributions to the understanding of the pineal gland and how it is regulated during the sleep-wake cycle.
Sir Edward Battersby Bailey FRS (1881–1965): British geologist, director of the British Geological ******.
Sir Patrick Bateson FRS (1938–): English biologist and science writer, Emeritus Professor of ethology at Cambridge University and president of the Zoological Society of London.
William Bateson (1861–1926): British geneticist, a Fellow of St. John's College, Cambridge, where he eventually became Master. He was the first person to use the term genetics to describe the study of heredity and biological inheritance, and the chief populariser of the ideas of Gregor Mendel following their rediscovery.
George Wells Beadle (1903–1989): American geneticist. Along with Edward Lawrie Tatum, he won the Nobel Prize in Physiology or Medicine in 1958 for discovering the role of genes in regulating biochemical events within cells.
John Stewart Bell (1928–1990): Irish physicist. Best known for his discovery of Bell's theorem.
Charles H. Bennett (1943–): American physicist, information theorist and IBM Fellow at IBM Research. He is best known for his work in quantum cryptography, quantum teleportation and is one of the founding fathers of modern quantum information theory.
John Desmond Bernal (1901–1971): British biophysicist. Best known for pioneering X-ray crystallography in molecular biology.
Paul Bert (1833–1886): French zoologist, physiologist and politician. Known for his research on oxygen toxicity.
Marcellin Berthelot (1827–1907): French chemist and politician noted for the Thomsen-Berthelot principle of thermochemistry. He synthesized many organic compounds from inorganic substances and disproved the theory of vitalism.
Claude Louis Berthollet (1748–1822): French chemist.
Norman Bethune (1890–1939): Canadian physician and medical innovator.
Patrick Blackett OM, CH, FRS (1897–1974): Nobel Prize winning English experimental physicist known for his work on cloud chambers, cosmic rays, and paleomagnetism.
Susan Blackmore (1951–): English psychologist and memeticist, best known for her book The Meme Machine.
Niels Bohr (1885-1962): Danish physicist. Best known for his foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.
Sir Hermann Bondi KCB, FRS (1919–2005): Anglo-Austrian mathematician and cosmologist, best known for co-developing the steady-state theory of the universe and important contributions to the theory of general relativity.
Paul D. Boyer (1918–): American biochemist and Nobel Laureate in Chemistry in 1997.
Calvin Bridges (1889–1938): American geneticist, known especially for his work on fruit fly genetics.
Percy Williams Bridgman (1882–1961): American physicist who won the 1946 Nobel Prize in Physics for his work on the physics of high pressures.
Paul Broca (1824–1880): French physician, surgeon, anatomist, and anthropologist. Broca's work also contributed to the development of physical anthropology, advancing the science of anthropometry.
Sheldon Brown (1944–2008): Bicycle mechanic and technical authority on almost every aspect of bicycles.
Ruth Mack Brunswick (1897–1946): American psychologist, a close confidant of and collaborator with Sigmund Freud.
Robert Cailliau (1947–): Belgian informatics engineer and computer scientist who, together with Sir Tim Berners-Lee, developed the World Wide Web.
John D. Carmack (1970–): American game programmer and the co-founder of id Software. Carmack was the lead programmer of the id computer games Commander Keen, Wolfenstein 3D, Doom, Quake, Rage and their sequels.
Sean M. Carroll (1966–): American cosmologist specializing in dark energy and general relativity.
James Chadwick (1891–1974): English physicist. He won the 1935 Nobel prize in physics for his discovery of the neutron.
Subrahmanyan Chandrasekhar (1910–1995): Indian American astrophysicist known for his theoretical work on the structure and evolution of stars. He was awarded the Nobel Prize in Physics in 1983.
William Kingdon Clifford FRS (1845–1879): English mathematician and philosopher, co-introducer of geometric algebra, the first to suggest that gravitation might be a manifestation of an underlying geometry, and coiner of the expression "mind-stuff".
Frank Close OBE (1945–): British particle physicist, Professor of Physics at the University of Oxford and a Fellow of Exeter College, Oxford, known for his lectures and writings making science intelligible to a wider audience, for which he was awarded the Institute of Physics's Kelvin Medal and Prize.
John Horton Conway (1937–): British mathematician active in the theory of finite groups, knot theory, number theory, combinatorial game theory and coding theory. He is best known for the invention of the cellular automaton called Conway's Game of Life.
Brian Cox OBE (1968–): English particle physicist, Royal Society University Research Fellow, Professor at the University of Manchester. Best known as a presenter of a number of science programmes for the BBC. He also had some fame in the 1990s as the keyboard player for the pop band D:Ream.
Jerry Coyne (1949–): American professor of biology, known for his books on evolution and commentary on the intelligent design debate.
Francis Crick (1916–2004): English molecular biologist, physicist, and neuroscientist; noted for being one of the co-discoverers of the structure of the DNA molecule in 1953. He was awarded the Nobel Prize in Physiology or Medicine in 1962.
James F. Crow (1916–2012): American geneticist.
Pierre Curie (1859–1906): French physicist, a pioneer in crystallography, magnetism, piezoelectricity and radioactivity, and Nobel laureate. In 1903 he received the Nobel Prize in Physics with his wife, Marie Curie, and Henri Becquerel, "in recognition of the extraordinary services they have rendered by their joint researches on the radiation phenomena discovered by Professor Henri Becquerel".
Jean le Rond d'Alembert (1717–1783): French mathematician, mechanician, physicist, philosopher, and music theorist. He was also co-editor with Denis Diderot of the Encyclopédie.
Sir Howard Dalton FRS (1944–2008): British microbiologist, Chief Scientific Advisor to the UK's Department for Environment, Food and Rural Affairs from March 2002 to September 2007.
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.
Augustus De Morgan (1806–1871): British mathematician and logician. He formulated De Morgan's laws and introduced the term mathematical induction, making its idea rigorous.
Jean Baptiste Delambre (1749–1822): French mathematician and astronomer.
Arnaud Denjoy (1884–1974): French mathematician, noted for his contributions to harmonic analysis and differential equations.
David Deutsch (1953–): Israeli-British physicist at the University of Oxford. He pioneered the field of quantum computation by being the first person to formulate a description for a quantum Turing machine, as well as specifying an algorithm designed to run on a quantum computer.
Jared Diamond (1937–): American scientist and author whose work draws from a variety of fields. He is best known for his award-winning popular science books The Third Chimpanzee, Guns, Germs, and Steel, and Collapse: How Societies Choose to Fail or Succeed.
Paul Dirac (1902–1984): British theoretical physicist, one of the founders of quantum mechanics, predicted the existence of antimatter, and won the Nobel Prize in Physics in 1933.
Thomas Edison: American inventor, one of the best inventors of all time. During his career Edison patented more than 1,000 inventions, including the electric light, the phonograph, and the motion-picture camera.
Paul Ehrenfest (1880–1933): Austrian-Dutch physicist. Made major contributions to the field of statistical mechanics and its relations with quantum mechanics.
Thomas Eisner (1929–2011): German-American entomologist and ecologist, known as the "father of chemical ecology".
Albert Ellis (1913–2007): American psychologist who in 1955 developed Rational Emotive Behavior Therapy.
Paul Erdős (1913–1996), Hungarian mathematician. He published more papers than any other mathematician in history, working with hundreds of collaborators. He worked on problems in combinatorics, graph theory, number theory, classical analysis, approximation theory, set theory, and probability theory.
Richard R. Ernst (1933–): Swiss physical chemist. He was awarded the Nobel Prize in Chemistry in 1991.
Hugh Everett III (1930–1982): American physicist who first proposed the many-worlds interpretation (MWI) of quantum physics, which he termed his "relative state" formulation.
Sandra Faber (1944–): American University Professor of Astronomy and Astrophysics at the University of California, Santa Cruz, also working at the Lick Observatory, who headed the team that discovered 'The Great Attractor.
Gustav Fechner (1801–1887): German experimental psychologist. An early pioneer in experimental psychology and founder of psychophysics.
Leon Festinger (1919–1989): American social psychologist famous for his Theory of Cognitive Dissonance.
Richard Feynman (1918–1988): American theoretical physicist, best known for his work in renormalizing Quantum electrodynamics (QED) and his path integral formulation of quantum mechanics . He won the Nobel Prize in Physics in 1965.
James Franck (1882–1964): German physicist. Won the Nobel Prize in Physics in 1925.
Sigmund Freud (1856–1939): Father of psychoanalysis.
Erich Fromm (1900–1980): renowned Jewish-German-American social psychologist, psychoanalyst, and humanistic philosopher, associated with the Frankfurt School of critical theory.
Christer Fuglesang (1957–): Swedish astronaut and physicist.
George Gamow (1904–1968): Russian-born theoretical physicist and cosmologist. An early advocate and developer of Lemaître's Big Bang theory.
Joseph Louis Gay-Lussac (1772–1850): French chemist and physicist. He is known mostly for two laws related to gases.
Vitaly Ginzburg (1916–2009): Russian theoretical physicist and astrophysicist who was awarded the Nobel Prize in Physics in 2003. He was also awarded the Wolf Prize in Physics in 1994/95.
Gordon Gould (1920–2005): American physicist. He is widely, but not universally, credited with the invention of the laser. Gould is best known for his thirty-year fight with the United States Patent and Trademark Office to obtain patents for the laser and related technologies.
Susan Greenfield, Baroness Greenfield, CBE (1950–): British scientist, writer and broadcaster, specialising in the physiology of the brain, who has worked to research and bring attention to Parkinson's disease and Alzheimer's disease.
Herb Grosch (1918–2010): Canadian-American computer scientist, perhaps best known for Grosch's law, which he formulated in 1950.
Alan Guth (1947–): American theoretical physicist and cosmologist.
Jacques Hadamard (1865–1963): French mathematician. He made major contributions in number theory, complex function theory, differential geometry and partial differential equations.
Jonathan Haidt (c.1964–): Associate professor of psychology at the University of Virginia, focusing on the psychological bases of morality across different cultures, and author of The Happiness Hypothesis.
E. T. 'Teddy' Hall (1924–2001): English archaeological scientist, famous for exposing the Piltdown Man fraud and dating the Turin Shroud as a medieval fake.
Sir James Hall (1761–1832): Scottish geologist and chemist, President of the Royal Society of Edinburgh and leading figure in the Scottish Enlightenment.
Edmond Halley (1656-1742): English astronomer, geophysicist, mathematician, meteorologist and physicist. Best known for computing the orbit of the eponymous Halley's Comet.
Beverly Halstead (1933–1991): British paleontologist and populariser of science.
Frances Hamerstrom (1908–1998): American author, naturalist and ornithologist known for her work with the greater prairie chicken in Wisconsin, and for her research on birds of prey.
W. D. Hamilton (1936–2000): British evolutionary biologist, widely recognised as one of the greatest evolutionary theorists of the 20th century.
G. H. Hardy (1877–1947): a prominent English mathematician, known for his achievements in number theory and mathematical analysis.
Herbert A. Hauptman (1917–2011), American mathematician. Along with Jerome Karle, won the Nobel Prize in Chemistry in 1985.
Stephen Hawking (1942–): arguably the world's pre-eminent scientist advocates atheism in The Grand Design
Peter Higgs (1929–): British theoretical physicist, recipient of the Dirac Medal and Prize, known for his prediction of the existence of a new particle, the Higgs boson, nicknamed the "God particle".
Roald Hoffmann (1937–): American theoretical chemist who won the 1981 Nobel Prize in Chemistry.
Lancelot Hogben (1895–1975): English experimental zoologist and medical statistician, now best known for his popularising books on science, mathematics and language.
Nicholas Humphrey (1943–): British psychologist, working on consciousness and belief in the supernatural from a Darwinian perspective, and primatological research into Machiavellian intelligence theory.
Sir Julian Huxley FRS (1887–1975): English evolutionary biologist, a leading figure in the mid-twentieth century evolutionary synthesis, Secretary of the Zoological Society of London (1935–1942), the first Director of UNESCO, and a founding member of the World Wildlife Fund.
Frédéric Joliot-Curie (1900–1958): French physicist and Nobel Laureate in Chemistry in 1935.
Irène Joliot-Curie (1897–1956): French scientist. She is the daughter of Marie Curie and Pierre Curie. She along with her husband, Frédéric Joliot-Curie, was awarded the Nobel Prize for Chemistry in 1935.
Steve Jones (1944–): British geneticist, Professor of genetics and head of the biology department at University College London, and television presenter and a prize-winning author on biology, especially evolution; one of the best known contemporary popular writers on evolution.
Stuart Kauffman (1939-): American theoretical biologist and complex systems researcher concerning the origin of life on Earth. He is best known for arguing that the complexity of biological systems and organisms might result as much from self-organization and far-from-equilibrium dynamics as from Darwinian natural selection, as well as for applying models of Boolean networks to simplified genetic circuits.
Samuel Karlin (1924–2007): American mathematician. He did extensive work in mathematical population genetics.
Ancel Keys (1904–2004): American scientist who studied the influence of diet on health. He examined the epidemiology of cardiovascular disease (CVD) and was responsible for two famous diets: K-rations and the Mediterranean diet.
Lawrence Krauss (1954-): Professor of physics at Arizona State University and popularizer of science. Krauss speaks regularly at atheist conferences, like Beyond Belief and Atheist Alliance International.
Herbert Kroemer (1928–): German-American professor of electrical and computer engineering at the University of California, Santa Barbara. In 2000, he along with Zhores I. Alferov, was awarded the Nobel Prize in Physics "for developing semiconductor heterostructures used in high-speed- and opto-electronics".
Harold Kroto (1939–): 1996 Nobel Laureate in Chemistry.
Alfred Kinsey (1894–1956): American biologist, sexologist and professor of entomology and zoology.
Ray Kurzweil (1948–): American author, scientist, inventor and futurist. He is the author of several books on health, artificial intelligence (AI), transhumanism, the technological singularity, and futurism.
Joseph Louis Lagrange (1736–1813): mathematician and astronomer.
Jérôme Lalande (1732–1807): French astronomer and writer.
Lev Landau (1908-1968): Soviet physicist. He received the 1962 Nobel Prize in Physics for his development of a mathematical theory of superfluidity.
Pierre-Simon Laplace (1749 –1827): French mathematician and astronomer whose work was pivotal to the development of mathematical astronomy and statistics, and anticipated the discovery of galaxies other than the Milky Way and the existence of black holes.
Richard Leakey (1944–): Kenyan paleontologist, archaeologist and conservationist.
Jean-Marie Lehn (1939–): French chemist. He received the 1987 Nobel Prize in Chemistry, together with Donald Cram and Charles Pedersen.
Sir John Leslie (1766–1832): Scottish mathematician and physicist best remembered for his research into heat; he was the first person to artificially produce ice, and gave the first modern account of capillary action.
Nikolai Lobachevsky (1792–1856): Russian mathematician. Known for his works on hyperbolic geometry.
H. Christopher Longuet-Higgins FRS (1923–2004): English theoretical chemist and a cognitive scientist.
Paul MacCready (1925–2007): American aeronautical engineer. He was the founder of AeroVironment and the designer of the human-powered aircraft that won the Kremer prize.
Ernst Mach (1838-1916): Austrian physicist and philosopher. Known for his contributions to physics such as the Mach number and the study of shock waves.
Andrey Markov (1856–1922): Russian mathematician. He is best known for his work on stochastic processes.
Samarendra Maulik (1881–1950): Indian entomologist specialising in the Coleoptera, who worked at the British Museum (Natural History) and a Professor of Zoology at the University of Calcutta.
Pierre Louis Maupertuis (1698–1759): French mathematician, philosopher and man of letters. He is often credited with having invented the principle of least action; a version is known as Maupertuis' principle – an integral equation that determines the path followed by a physical system.
John Maynard Smith (1920–2004): British evolutionary biologist and geneticist, instrumental in the application of game theory to evolution, and noted theorizer on the evolution of sex and signalling theory.
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.
John McCarthy (1927–2011): American computer scientist and cognitive scientist who received the Turing Award in 1971 for his major contributions to the field of Artificial Intelligence (AI). He was responsible for the coining of the term "Artificial Intelligence" in his 1955 proposal for the 1956 Dartmouth Conference and was the inventor of the Lisp programming language.
Sir Peter Medawar (1915–1987): Nobel Prize-winning British scientist best known for his work on how the immune system rejects or accepts tissue transplants.
Jeff Medkeff (1968–2008): American astronomer, prominent science writer and educator, and designer of robotic telescopes.
Élie Metchnikoff (1845–1916): Russian biologist, zoologist and protozoologist. He is best known for his research into the immune system. Mechnikov received the Nobel Prize in Medicine in 1908, shared with Paul Ehrlich.
Jonathan Miller CBE (1934–): British physician, actor, theatre and opera director, and 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.
Marvin Minsky (1927–): American cognitive scientist and computer scientist in the field of artificial intelligence (AI) in MIT.
Peter D. Mitchell (1920–1992): 1978-Nobel-laureate British biochemist. His mother was an atheist and he himself became an atheist at the age of 15.
Jacob Moleschott (1822–1893): Dutch physiologist and writer on dietetics.
Gaspard Monge (1746–1818): French mathematician. Monge is the inventor of descriptive geometry.
Jacques Monod (1910–76): French biologist who won the Nobel Prize in Physiology or Medicine in 1965 for discoveries concerning genetic control of enzyme and virus synthesis.
Thomas Hunt Morgan (1866–1945): American evolutionary biologist, geneticist and embryologist. He won the Nobel Prize in Physiology or Medicine in 1933 for discoveries relating the role the chromosome plays in heredity.
Desmond Morris (1928–): English zoologist and ethologist, famous for describing human behaviour from a zoological perspective in his books The Naked Ape and The Human Zoo.
Fritz Müller (1821–1897): German biologist who emigrated to Brazil, where he studied the natural history of the Amazon rainforest and was an early advocate of evolutionary theory.
Hermann Joseph Muller (1890–1967): American geneticist and educator, best known for his work on the physiological and genetic effects of radiation (X-ray mutagenesis). He won the Nobel Prize in Physiology or Medicine in 1946.
PZ Myers (1957–): American biology professor at the University of Minnesota and a blogger via his blog, Pharyngula.
John Forbes Nash, Jr. (1928–): American mathematician whose works in game theory, differential geometry, and partial differential equations. He shared the 1994 Nobel Memorial Prize in Economic Sciences with game theorists Reinhard Selten and John Harsanyi.
Yuval Ne'eman (1925–2006): Israeli theoretical physicist, military scientist, and politician. One of his greatest achievements in physics was his 1961 discovery of the classification of hadrons through the SU(3)flavour symmetry, now named the Eightfold Way, which was also proposed independently by Murray Gell-Mann.
Alfred Nobel (1833–1896): Swedish chemist, engineer, innovator, and armaments manufacturer. He is the inventor of dynamite. In his last will, he used his enormous fortune to institute the Nobel Prizes.
Paul Nurse (1949–): 2001 Nobel Laureate in Physiology or Medicine.
Mark Oliphant (1901–2000): Australian physicist and humanitarian. He played a fundamental role in the first experimental demonstration of nuclear fusion and also the development of the atomic bomb.
Alexander Oparin (1894-1980): Soviet biochemist.
J. Robert Oppenheimer (1904–1967): American theoretical physicist and professor of physics at the University of California, Berkeley. Along with Enrico Fermi, he is often called the "father of the atomic bomb" for his role in the Manhattan Project.
Wilhelm Ostwald (1853–1932): Baltic German chemist. He received the Nobel Prize in Chemistry in 1909 for his work on catalysis, chemical equilibria and reaction velocities. He, along with Jacobus Henricus van 't Hoff and Svante Arrhenius, are usually credited with being the modern founders of the field of physical chemistry.
Robert L. Park (born 1931): scientist, University of Maryland professor of physics, and author of Voodoo Science and Superstition.
Linus Pauling (1901–1994): American chemist, Nobel Laureate in Chemistry (1954) and Peace (1962)
John Allen Paulos (1945–): Professor of mathematics at Temple University in Philadelphia and writer, author of Irreligion: A Mathematician Explains Why the Arguments for God Just Don't Add Up (2007)
Ivan Pavlov (1849–1936): Nobel Prize winning Russian physiologist, psychologist, and physician, widely known for first describing the phenomenon of classical conditioning.
Sir Roger Penrose (1931–): English mathematical physicist and Emeritus Rouse Ball Professor of Mathematics at the Mathematical Institute, University of Oxford and Emeritus Fellow of Wadham College. He is renowned for his work in mathematical physics, in particular his contributions to general relativity and cosmology. He is also a recreational mathematician and philosopher and refers to himself as an atheist.
Francis Perrin (1901–1992): French physicist, co-establisher of the possibility of nuclear chain reactions and nuclear energy production.
Jean Baptiste Perrin (1870–1942): French physicist. He won the Nobel Prize in Physics in 1926.
Max Perutz (1914–2002): Austrian-born British molecular biologist, who shared the 1962 Nobel Prize for Chemistry with John Kendrew, for their studies of the structures of hemoglobin and globular proteins.
Massimo Pigliucci (1964–): Professor of Ecology and Evolution at the Stony Brook University who known as an outspoken critic of creationism and advocate of science education.
Steven Pinker (1954–): Canadian-born American psychologist.
Norman Pirie FRS (1907–1997): British biochemist and virologist co-discoverer in 1936 of viral crystallization, an important milestone in understanding DNA and RNA.
Ronald Plasterk (1957–): Dutch prize-winning molecular geneticist and columnist, and Minister of Education, Culture and Science in the fourth Balkenende cabinet for the Labour Party.
Derek J. de Solla Price (1922–1983): British-American historian of science.
Frank P. Ramsey (1903–1930): British mathematician who also made significant contributions in philosophy and economics.
Marcus J. Ranum (1962–): American computer and network security researcher and industry leader. He is credited with a number of innovations in firewalls.
Martin Rees, Baron Rees of Ludlow (1942–): British cosmologist and astrophysicist.
Richard J. Roberts (1943–): British biochemist and molecular biologist. He won the Nobel Prize in Physiology or Medicine in 1993 for the discovery of introns in eukaryotic DNA and the mechanism of gene-splicing.
Steven Rose (1938–): Professor of Biology and Neurobiology at the Open University and University of London, and author of several popular science books.
Marshall Rosenbluth (1927–2003) American physicist, nicknamed "the Pope of Plasma Physics". He created the Metropolis algorithm in statistical mechanics, derived the Rosenbluth formula in high-energy physics, and laid the foundations for instability theory in plasma physics.
Oliver Sacks (1933–): United States-based British neurologist, who has written popular books about his patients, the most famous of which is Awakenings.
Carl Sagan (1934–1996): American astronomer and astrochemist, a highly successful popularizer of astronomy, astrophysics, and other natural sciences, and pioneer of exobiology and promoter of the SETI. Although Sagan has been identified as an atheist according to some definitions, he rejected the label, stating "An atheist has to know a lot more than I know." He was an agnostic who, while maintaining that the idea of a creator of the universe was difficult to disprove, nevertheless disbelieved in God's existence, pending sufficient evidence.
Andrei Sakharov (1921-1989): Soviet nuclear physicist, dissident and human rights activist.
Robert Sapolsky (1957–): Professor of Biological Sciences and Professor of Neurology and Neurological Sciences at Stanford University.
Marcus du Sautoy (1965–): mathematician and holder of the Charles Simonyi Chair for the Public Understanding of Science.
Erwin Schrödinger (1887-1961): Austrian-Irish physicist and theoretical biologist. A pioneer of quantum mechanics and winner of the 1933 Nobel Prize for Physics.
Amartya Kumar Sen (1933–): 1998 Nobel Laureate in Economics.
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.
Edwin Shneidman (1918–2009): American suicidologist and thanatologist.
William Shockley (1910–1989): American physicist and inventor. Along with John Bardeen and Walter Houser Brattain, Shockley co-invented the transistor, for which all three were awarded the 1956 Nobel Prize in Physics.
William James Sidis (1898–1944): American mathematician, cosmologist, inventor, linguist, historian and child prodigy.
Michael Smith (1932–2000): British-born Canadian biochemist and Nobel Laureate in Chemistry in 1993.
Lee Smolin (1955–): American theoretical physicist, a researcher at the Perimeter Institute for Theoretical Physics, and an adjunct professor of physics at the University of Waterloo.
Alan Sokal (1955–): American professor of mathematics at University College London and professor of physics at New York University. To the general public he is best known for his criticism of postmodernism, resulting in the Sokal affair in 1996.
Richard Stallman (1953–): American software freedom activist, hacker, and software developer.
Hugo Steinhaus (1887–1972): Polish mathematician and educator.
Victor J. Stenger (1935–): American physicist, emeritus professor of Physics and Astronomy at the University of Hawaii and adjunct professor of Philosophy at the University of Colorado. Author of the book God: The Failed Hypothesis.
Jack Suchet (1908–2001): South African born obstetrician, gynaecologist and venereologist, who carried out research on the use of penicillin in the treatment of venereal disease with Sir Alexander Fleming.
Eleazar Sukenik (1889–1953): Israeli archaeologist and professor of Hebrew University in Jerusalem, undertaking excavations in Jerusalem, and recognising the importance of the Dead Sea Scrolls to Israel.
John Sulston (1942–): British biologist. He is a joint winner of the 2002 Nobel Prize in Physiology or Medicine.
Leonard Susskind (1940–): American theoretical physicist; a founding father of superstring theory and professor of theoretical physics at Stanford University.
Raymond Tallis (1946–): Leading British gerontologist, philosopher, poet, novelist and cultural critic.
Arthur Tansley (1871–1955): English botanist who was a pioneer in the science of ecology.
Alfred Tarski (1901-1983): Polish logician and mathematician. A prolific author best known for his work on model theory, metamathematics, and algebraic logic.
Nikolaas Tinbergen (1907–1988): Dutch ethologist and ornithologist who shared the 1973 Nobel Prize in Physiology or Medicine with Karl von Frisch and Konrad Lorenz for their discoveries concerning organization and elicitation of individual and social behaviour patterns in animals.
Gherman Titov (1935–2000): Soviet cosmonaut and the second human to orbit the Earth.
Linus Torvalds (1969–): Finnish software engineer, creator of the Linux kernel.
Alan Turing (1912–1954): English mathematician, logician, and cryptographer; often considered to be the father of modern computer science. The Turing Award, often recognized as the "Nobel Prize of computing", is named after him.
Matthew Turner (died ca. 1789): chemist, surgeon, teacher and radical theologian, author of the first published work of avowed atheism in Britain (1782).
Nikolai Vavilov (1887–1943): Russian and Soviet botanist and geneticist best known for having identified the centres of origin of cultivated plants. He devoted his life to the study and improvement of wheat, corn, and other cereal crops that sustain the global population.
J. Craig Venter (1946–): American biologist and entrepreneur, one of the first researchers to sequence the human genome, and in 2010 the first to create a cell with a synthetic genome.
Vladimir Vernadsky (1863–1945): Ukrainian and Soviet mineralogist and geochemist who is considered one of the founders of geochemistry, biogeochemistry, and of radiogeology. His ideas of noosphere were an important contribution to Russian cosmism.
George Wald (1906–1997): American scientist who is best known for his work with pigments in the retina. He won a share of the 1967 Nobel Prize in Physiology or Medicine with Haldan Keffer Hartline and Ragnar Granit.
W. Grey Walter (1910–1977): American neurophysiologist famous for his work on brain waves, and robotician.
James D. Watson (1928–): 1962-Nobel-laureate and co-discover of the structure of DNA.
Joseph Weber (1919–2000): American physicist, who gave the earliest public lecture on the principles behind the laser and the maser, and developed the first gravitational wave detectors (Weber bars).
Steven Weinberg (1933–): American theoretical physicist. He won the Nobel Prize in Physics in 1979 for the unification of electromagnetism and the weak force into the electroweak force.
Victor Weisskopf (1908–2002): Austrian-American theoretical physicist, co-founder and board member of the Union of Concerned Scientists.
Frank Whittle (1907–1996): English aerospace engineer, inventor, aviator and Royal Air Force officer. He is credited with independently inventing the turbojet engine (some years earlier than Germany's Dr. Hans von Ohain) and is regarded by many as the father of jet propulsion.
Ian Wilmut (1944-): English embryologist and is currently Director of the Medical Research Council Centre for Regenerative Medicine at the University of Edinburgh. He is best known as the leader of the research group that in 1996 first cloned a mammal from an adult somatic cell, a Finnish Dorset lamb named Dolly.
David Sloan Wilson (1949–): American evolutionary biologist, son of Sloan Wilson, proponent of multilevel selection theory and author of several popular books on evolution.
Edward Witten (1951–): American theoretical physicist with a focus on mathematical physics who is a professor of Mathematical Physics at the Institute for Advanced Study. Witten is a researcher in superstring theory, a theory of quantum gravity, supersymmetric quantum field theories and other areas of mathematical physics.
Lewis Wolpert CBE FRS FRSL (1929–): developmental biologist, author, and broadcaster.
Steve Wozniak (1950–): co-founder of Apple Computer and inventor of the Apple I and Apple II.
Elizur Wright (1804–1885): American mathematician and abolitionist, sometimes described as the "father of life insurance" for his pioneering work on actuarial tables.
Will Wright (1960–): American computer game designer and co-founder of the game development company Maxis.
Wilhelm Wundt (1832–1920): German physician, psychologist, physiologist, philosopher, and professor. He is regarded as the "father of experimental psychology".
Konrad Zuse (1910–1995): German civil engineer and computer pioneer. His greatest achievement was the world's first functional program-controlled Turing-complete computer, the Z3, which became operational in May 1941.
Fritz Zwicky (1898–1974): Swiss astronomer and astrophysicist