Thomas's best-known film roles were as Steve Carlson in the 1986 film About Last Night... and as Vice Principal Phil Gills in the 1987 comedy Summer School. Thomas has made many guest appearances on TV shows, including Misfits of Science, Midnight Caller, Party of Five, and Queer as Folk.
His biggest roles have been in two films, MISSING BRENDAN and AMBULANCE GIRL in which he plays opposite Kathy Bates.