(written from a Production point of view)
As an actor, Sullivan is best recognized for his recurring role as Tommy on the hit television series Happy Days. He also appeared in two films featuring Star Trek: The Next Generation guest star Vincent Schiavelli: Ron Howard's Night Shift in 1982 (also featuring Clint Howard; and the 1984 cult science fiction classic The Adventures of Buckaroo Banzai: Across the Eighth Dimension! (also starring Peter Weller, Christopher Lloyd, Clancy Brown, and Robert Ito). In the latter, he played a Black Electroid named John Gant who was forced to destroy himself, but not before sending his sympathies to the friends and family of his lost comrade: "John Veluk is dead… he fell on his head."
Sullivan left acting afterwards to focus on directing. His directorial credits include the hit films How Stella Got Her Groove Back (starring Whoopi Goldberg), Barbershop 2: Back in Business, and Guess Who.