Originating from Brooklyn, New York, MacKenzie entered the screen with a small part in Sidney Lumet’s 1975 crime drama Dog Day Afternoon and soon accumulated numerous guest spots on series such as Three’s Company, The Love Boat, Diff’rent Strokes, The Facts of Life and WKRP in Cincinnati, while also appearing in after-school specials and TV movies. His first regular role arrived in the short-lived…
