||This article relies largely or entirely upon a single source. (July 2009)
This is a list of people and organizations that promote or practice scientific skepticism. In general, they favor science and are opposed to pseudoscience and quackery. They are generally skeptical of parapsychology, the paranormal, and alternative medicine.
- James Alcock, psychologist. Author of several skeptical books and articles.
- Isaac Asimov, biochemist, author. Wrote or edited over 500 popular science, other nonfiction, and science fiction books, including the Foundation series. Founding member of CSICOP (now CSI).
- Robert A. Baker, psychologist, author. Wrote books on ghosts, alien abductions and false memory syndrome.
- Banachek, mentalist. Participant in Project Alpha. Real name Steve Shaw
- Stephen Barrett, psychiatrist. Cofounder of the National Council Against Health Fraud, critic of alternative medicine. Founder of the Quackwatch website.
- Barry Beyerstein, psychologist. Founding member of CSICOP (now CSI).
- Susan Blackmore, parapsychologist. Author, lecturer, and broadcaster.
- Derren Brown, mentalist, critic of alleged psychics and spiritual mediums.
- Robert Todd Carroll, philosopher. Author of The Skeptic's Dictionary book and website.
- Milbourne Christopher, magician. Founding member of CSICOP (now CSI).
- Derek Colanduno and Robynn McCarthy, co-hosts of the podcast Skepticality: The Official Podcast of Skeptic Magazine.
- David Colquhoun, pharmacologist and author of the website Improbable Science.
- Narendra Dabholkar, author and the founder-president of Maharashtra Andhashraddha Nirmoolan Samiti.
- Richard Dawkins, evolutionary biologist and author known for promoting the gene-centric view of evolution (in his book The Selfish Gene), coining of the term meme, and atheist activism.
- Daniel Dennett, philosopher. Author of Darwin's Dangerous Idea: Evolution and the Meanings of Life and Breaking the Spell: Religion as a Natural Phenomenon.
- Ann Druyan, popular science author and current head of the Planetary Society. Widow of the astronomer Carl Sagan.
- Brian Dunning, host of skeptical podcast Skeptoid.
- Mark Edward Skeptologist, column on Skepticblog, invented term Guerrilla Skepticism. Exposes psychics, steering member of IIG and author of tell-all psychic book.
- Kendrick Frazier, Editor of the Skeptical Inquirer.
- Martin Gardner, author, recreational mathematician. Writer of the long-running 'Mathematical Games' column in Scientific American, and a longstanding columnist for the Skeptical Inquirer. Founding member of CSICOP (now CSI).
- Pamela L. Gay, astronomer, co-host of Astronomy Cast, assistant research professor in the STEM center at SIUE and project director for CosmoQuest.
- Ben Goldacre, physician, journalist. Author of the "Bad Science" column in The Guardian (UK newspaper).
- Stephen Jay Gould, paleontologist, evolutionary biologist, historian of science, Harvard University.
- Sven Ove Hansson, philosopher. Founding Chairperson of the Swedish Skeptics (Vetenskap och Folkbildning) and Editor of the organisation's journal Folkvett.
- Douglas Hofstadter, physicist, artificial intelligence researcher. Author of Pulitzer Prize-winning book Gödel, Escher, Bach: The Eternal Golden Braid and Scientific American column "Metamagical Themas".
- Harry Houdini, magician. Critic of Modern Spiritualism who exposed fraudulent psychics and mediums and publicized their methods.
- Ray Hyman, psychologist, critic of parapsychology. Longstanding contributor to the Skeptical Inquirer. Founding member of CSICOP (now CSI).
- Jamie Hyneman, creator of MythBusters TV show.
- Leo Igwe, Nigerian human rights advocate.
- Penn Jillette magician, half of Penn & Teller duo. Creator and host of the television series Bullshit!
- Philip J. Klass, aerospace journalist. Known for his investigations of UFOs. Longstanding contributor to the Skeptical Inquirer. Founding member of CSICOP (now CSI).
- Paul Kurtz, philosopher, author. Founder of CSICOP (now CSI), Publisher of the Skeptical Inquirer.
- Pat Linse, illustrator. Cofounder of the Skeptics Society, Copublisher and Art Director of Skeptic magazine. Creator of Junior Skeptic magazine.
- Daniel Loxton, illustrator, writer. Editor of Junior Skeptic magazine (bound into Skeptic magazine).
- Tim Minchin, comedian, musician, actor. Has many songs illustrating his skepticism, most notably, Storm.
- Joe Nickell, investigator of the paranormal, author. Columnist for the Skeptical Inquirer.
- Steven Novella, neurologist. Founder of the New England Skeptical Society and host of The Skeptics' Guide to the Universe podcast.
- James Oberg, aerospace journalist. Critic of UFOs and claims of a moon landing hoax.
- Robert L. Park, physicist. Author of Voodoo Science.
- Trey Parker, writer, director. Creator of South Park TV show.
- Massimo Pigliucci, professor of philosophy at City University of New York and co-host of the skeptical podcast, Rationally Speaking.
- Philip Plait, astronomer, author. Founder of the Bad Astronomy website.
- Massimo Polidoro, writer, journalist. Student of James Randi, Co-Founder and Executive Director of CICAP, Research Fellow of CSICOP (now CSI).
- Basava Premanand publisher of the Indian Skeptic magazine and chairman of the Indian CSICOP.
- Benjamin Radford, Managing Editor of the Skeptical Inquirer.
- James Randi, magician. Founder of the James Randi Educational Foundation. Notable for offering a million dollar cash reward for verifiable demonstration under laboratory conditions of any paranormal ability or event. Conceived and directed Project Alpha. Founding member of CSICOP (now CSI).
- Emily Rosa, Guinness World Record youngest medical researcher; at age 11, published her study in the Journal of the American Medical Association on therapeutic touch, showing practitioners couldn't feel the "human energy field" when not looking.
- Carl Sagan, astronomer, popular science author, and media personality. Advocate for the Search for Extraterrestrial Intelligence (SETI) and founder of the Planetary Society (now headed by his widow, popular science writer Ann Druyan). Known for the television series Cosmos and the book The Demon Haunted World: Science as a Candle in the Dark. Founding member of CSICOP (now CSI).
- Adam Savage, creator of MythBusters TV show.
- Eugenie Scott, anthropologist. Executive Director of the National Center for Science Education (NCSE), critic of creationism and intelligent design.
- Robert Sheaffer, author. UFO investigator, columnist for the Skeptical Inquirer.
- Michael Shermer, historian, popular science author, founder of the Skeptics Society. Copublisher and Editor of Skeptic magazine. Also current writer for the Scientific American column "Skeptic".
- Matt Stone, writer, director. Creator of South Park TV show.
- Julia Sweeney, actress, comedian. Author and performer of Letting Go of God.
- Teller, magician, half of Penn & Teller duo. Creator and host of the television series Bullshit!
- Marcello Truzzi, sociologist. First editor of the Skeptical Inquirer. Critic of organized skepticism. Founding member of CSICOP (now CSI).
- Rebecca Watson, founder of Skepchick blog.
- Richard Wiseman, psychologist.
- Paul Zenon, magician and comedian.