Michael Edward Gross is an American television, movie and stage actor. He is known for his roles as Steven Keaton in the 1980s sitcom Family Ties and as Burt Gummer in the Tremors movies and subsequent TV series. He guest starred in an episode of Night Court, and portrayed a murderous bank robber in In the Line of Duty: The F.B.I. Murders. Other television credits include Boston Legal, How I Met Your Mother, Batman Beyond, ER, Parks and Recreation, Law & Order, and two of its spin-offs: SVU and Criminal Intent. Gross appeared on The Young and the Restless as River Baldwin. He had a special cameo in 2000 on Spin City as a therapist to Michael J. Fox's character on Fox's final show as a regular on that program. In November 1979, Gross originated the role of Greta in the Broadway production of Martin Sherman's Bent.