Peter Riegert is an American actor. He is best known for his roles as Donald "Boon" Schoenstein in Animal House (1978), oil company executive "Mac" MacIntyre in Local Hero (1983), pickle store owner Sam Posner in Crossing Delancey (1988) and Lt. Mitch Kellaway in The Mask (1994). He directed the short film By Courier (2000), for which he was nominated along with producer Ericka Frederick for the Academy Award for Best Live Action Short Film.
On television, Riegert had a recurring role as crooked Newark Assemblyman and later State Senator Ronald Zellman in seasons three and four of the HBO series The Sopranos (2001–2002), appeared as George Moore in the first season of the FX series Damages (2007), and portrayed Seth Green's father in the comedy series Dads (2013–2014). He was nominated for a Primetime Emmy Award for his performance in the HBO film Barbarians at the Gate in 1993.