Peter Riegert (born April 11, 1947) is an American stage and screen actor, writer, and director. He notable film roles include 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). On television, he is best known for his portrayal of crooked New Jersey State Assemblyman Ronald Zellman on The Sopranos.