Throughout his time with Suicidal Tendencies, Clark was very active in the band's songwriting, writing much of the music for his first album with the band, How Will I Laugh Tomorrow When I Can't Even Smile Today. His early compositions were mostly thrash-oriented but stuck to the bands already melodic sound. He continued to write music for the band that covered many different styles, best illustrated by The Art of Rebellion. As Clark claimed in an interview, "This is definitely our most diverse album yet, but it wasn't really planned that way, it's just the way we've grown musically."
Clark has had endorsement deals with B.C. Rich, Jackson and Yamaha guitars. He used to play a custom made BC Rich Gunslinger guitar with a skull wearing the classic Suicidal flip cap painted on it. Since the mid-1990s, he has played only Fernandes guitars, which he continues to endorse. Clark's early trademark image was his straight long hair and the "Suicidal" flip-cap. He has since cut his hair and began wearing a blue bandana.
On May 31, 2012, in Santa Cruz, California, Clark suffered a head injury during a pre-show incident resulting in concussion that also required nine staples to a gash on his head. He has since left Suicidal Tendencies. On June 6, 2012, a music video by one of Clark's bands, Phenagen, was released.
Clark and his wife Shannon have a daughter named Christina, who was seen at the end of the live video for "War Inside My Head".