James Randi (born August 7, 1928) (stage name The Amazing Randi) is a stage magician and scientific skeptic best known as a challenger of paranormal claims and pseudoscience. Born Randall James Hamilton Zwinge, in Toronto, Ontario in Canada, Randi is the founder of the James Randi Educational Foundation (JREF). Randi began his career as a magician, but when he retired at age 60, he switched to investigating paranormal, occult, and supernatural claims. Although often referred to as a "debunker," Randi rejects that title, describing himself as an "investigator." He has written about the paranormal, skepticism, and the history of magic. He was a frequent guest on The Tonight Show Starring Johnny Carson, and is occasionally featured on the television program Penn & Teller: Bullshit!