John has a tattoo on his chest that reads, "I Want to Be Brave," written backwards.
In 1999, John had to have angioplasty surgery after a near-heart attack. Then, in 2000, he had gastric bypass surgery to lose about half his body weight.
In 1992 John was in a severe motorcycle accident. It landed him in a wheelchair for several months, but he continued touring with the Blues Traveler through it all.
John enjoys collecting weapons. He owns many, including a $10,000 Civil War cannon.
John was arrested in 2003 for possession of marijuana. He was again arrested in 2007 for possession of marijuana and weapons.
John is the vocalist and the harmonica player in the American fusion group, The John Popper Project.
Years after his guest appearance, John wrote the 9th season theme for the series Roseanne.
John has released one solo album, "Zygote," in 1999.
John is the frontman of the band Blues Traveler.
John (about his deceased best friend and bassist for Blues Traveler): Despite the fact that Bob Sheehan was respected, loved and revered by all who knew him, or knew of his music, he was easily the most underestimated member of the band.
John: I'm a libertarian who is a Republican when pushed.