James Randi began his career as a magician and escape artist, but has gone on to become a leading investigator into the paranormal. His website describes him as "the world's most tireless investigator and demystifier of paranormal and pseudoscientific claims".
James Randi writes regular columns, appears on television shows and does live speaking. His book credits include The Truth About Uri Geller, The Faith Healers, Flim-Flam!, and An Encyclopedia of Claims, Frauds, and Hoaxes of the Occult and Supernatural.
James Randi tends to take a confrontational approach with those who he disagrees with, or who he believes are frauds. Although he does show genuine empathy for those who "don't know any better", he can be quite vicious when engaged in battle with charlatans. Likewise, many of his foes have launched ruthless counter-attacks against him.
James Randi is perhaps best-known as the man behind the the James Randi Education Foundation, established in 1996. The foundation has an ongoing prize competition which offers $US1,000,000 for anyone who can prove the existence of psychic or other paranormal abilities. Numerous people have applied but the prize has not been claimed.
James Randi's website: http://www.randi.org