He has an acting career spanning over thirty years and is often found playing surly New York types such as crooks or low level workers and mixes both drama and comedy roles. He often serves as a voice double and is often mistaken for fellow actor and friend Danny Devito.
Born in Brooklyn, New York, he is the son of actor Carmine Constanzo.
His first role was in the 1975 movie Dog Day Afternoon playing a cop, although this was an uncredited part. This was followed by a role as a paint store customer in the 1977 film Saturday Night Fever. Other movie roles include Die Hard 2, Dick Tracy, Total Recall, City Slickers, and Down and Derby. His television appearances are varied, with him appearing in Boston Legal, Hannah Montana, Friends, Days of our Lives, The Golden Girls and numerous other series. He also starred as Commissioner Stenchler in the Sega CD game Sewer Shark.
He is also a cartoon voice actor and has done voices on shows including The Fairly Oddparents, The Zeta Project, House of Mouse, Duckman, Bonkers, and Random! Cartoons, among others. He also did the voice of Detective Harvey Bullock on Batman: The Animated Series, Superman: The Animated Series, The New Batman Adventures and Static Shock, as well as in the theatrical release Mask of the Phantasm, and the video releases Batman & Mr. Freeze: SubZero, and Mystery of the Batwoman.