“A powerful reason for finding fault with debunkers who call themselves skeptics is that they are skeptical only in the one direction.” – Henry Bauer
Alcock is professor emeritus of psychology at York University in Toronto, and a fellow and member of the executive council of the Committee for Skeptical Inquiry.
Susan Blackmore is one of Britain's best-known media skeptics. A Committee for Skeptical Inquiry Fellow, she was awarded the CSI Distinguished Skeptic Award in 1991.
Sean M Carroll is a theoretical physicist at the California Institute of Technology.
Jerry Coyne is a professor in the Department of Ecology and Evolution at the University of Chicago.
Richard Dawkins, a CSI Fellow, was the winner of the CSI “In Praise Of Reason” Award in 1992. He is Professor of the Public Understanding of Science at Oxford.
David Deutsch works at the Centre for Quantum Computation at the Clarendon Laboratory, Oxford University.
Edzard Ernstwas the UK's first professor of Complementary and Alternative Medicine (CAM); the chair was endowed by the Laing foundation at the University of Exeter in 1993.
Chris French often appears on British radio and TV in the role of an “informed skeptic”. He is the editor of Skeptic magazine, a publication of the British and Irish Skeptics, produced and distributed by CSI.
Martin Gardner was a founding member of CSI, and has been described as the "single most powerful antagonist of the paranormal in the second half of the 20th century".
Susan Gerbic is a founder of the group “Guerrilla Skepticism on Wikipedia” and a co-founder of Monterey County Skeptics (California).
Bruce Hood is on the editorial advisory board of Skeptic and is a Professor of Psychology at Bristol University. He is best known for his idea that humans are hard-wired for religion and superstitious beliefs.
Nicholas Humphrey is an evolutionary psychologist at the London School of Economics. He held the Perrott-Warrick Research Fellowship for Psychical Research at Cambridge University.
One of the more extreme skeptics, Michael Hutchinson is U.K. representative of CSI and co-author (with journalist Simon Hoggart) of Bizarre Beliefs (1996).
Ray Hyman is Emeritus Professor of Psychology at the University of Oregon. He serves on the Executive Council of CSI and chairs its subcommittee on parapsychology.
Paul Kurtz was the Chairman of CSI, the Founder and Chairman of the Council for Secular Humanism, and of Prometheus Books, the leading publisher of skeptical literature.
David Marks is a CSI Fellow and Professor of Psychology and Research Director, Centre for Health and Counselling, City University, London.
P.Z. Myers is an associate professor of biology at the University of Minnesota, specializing in evolutionary development.
James Randi is a conjurer ("The Amazing Randi") and showman who describes himself on his website as "the world’s most tireless investigator and demystifier of paranormal and pseudo-scientific claims."
Michael Shermer is publisher of The Skeptic magazine, Director of The Skeptic Society, host of the Skeptics’ Lecture Series at the California Institute of Technology, and author of "Skeptic", a Scientific American column.
Simon Singh left Cambridge University with a doctorate in particle physics to work for the BBC as a science producer in 1990. He wrote two books on popular science, Fermat’s Last Theorem and The Big Bang.
Richard Wiseman is a fellow of CSI, a consultant editor of the Skeptical Inquirer, and an associate of Rationalist International.
Lewis Wolpert is Professor of Biology as Applied to Medicine at University College, London. He served for five years as Chairman of COPUS, the Committee for the Public Understanding of Science.
Tony Youens has risen to prominence as a media skeptic on U.K. television making many appearances on day-time shows such as “Vanessa”, “Kilroy”, “The Heaven and Earth Show” and “Stigmata: The Marks of God”.