Mark St. John, born as Mark Norton, replaced Vinnie Vincent in April 1984 in the rock band KISS. During St. John's stint with the band, he suffered arthritis (Reiter's Syndrome) in one hand and coudn't continue in to play with KISS.

St. John plays on part of the album Animalize (1984) but not the entire album. Bruce Kulick is featured on the song, Lonely is the Hunter. St. John was replaced by Bruce Kulick in December 1984. St. John appears in the Heavens on Fire video (1984).

After leaving KISS, St. John formed his new group White Tiger and released one LP in 1986. St. John teamed up with Jeff Scott Soto in 1988 to make a demo. St. John made another demo in 1990 with fellow KISS member Peter Criss.