Banachek tricked scientists for 2 years, 120 laboratory hours, into believing he could bend metal with his minds in the much touted 'Alpha Project' experiment, a set-up.
Committee for the Scientific Investigation of Claims of the Paranormal (CSICOP), an advocacy group of scientists and rationalist writers arguing for the anti-paranormal point of view.
Derren Brown (Has a detailed TV show, debunking people's beliefs.)
Susan Blackmore — Stopped lecturing and abandoned parapsychology altogether, because she could no longer endure the near fanatic and rude behavior of both believers and non-believers. Perhaps. She also lost faith in the existence of "psi". See her book Adventures of a Parapsychologist
Milbourne Christopher — Noted conjuring historian and master conjuror, his works debunking parapsychology are high quality.
Martin Gardner — Noted rationalist, puzzler, science writer, and master conjuror, has written many exposés.
Ray Hyman — Conjuror and noted research psychologist
James Randi — Master conjuror and author. In one exposé he revealed top evangelist Peter Poppoff and his wife used trickery to take advantage of their faithful congregation.
Ehrich Weiss (Harry Houdini) — Early 20th century master conjuror and author. He wanted to contact his deceased mother; he attended seances with this serious purpose but was always disappointed. In his will Houdini offered his great library to the American Society of Psychical Research on the condition that research officer and editor of the ASPR Journal, J. Malcolm Bird, resigned. Bird refused. Houdini's collection went to the Library of Congress.
Penn and Teller, gives these comic showmen material.