James 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, which he collectively calls "woo-woo." Although often referred to as a "debunker," Randi rejects that title owing to its perceived bias, instead 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!.