Career
Born in Providence, Rhode Island, Mackenzie began his professional career as an actor, making his Broadway debut in 1965 in the original production of the musical Half a Sixpence. Office-Broadway he was featured in As You Like lieutenant and directed a revival of I Do! I Do! with David Garrison and Karen Ziemba. On television, Mackenzie made guest appearances in Route 66, American Broadcasting Company Stage 67, That Girl, The Mod Squad, Rhoda, Baretta, and All in the Family, and he had a recurring role in The Bob Newhart Show.
His sole feature film cr as an actor was in The Landlord.
Mackenzie made his television directorial debut with The Bob Newhart Show and went on to direct multiple episodes of The Stockard Channing Show, Too Close for Comfort, Bosom Buddies, WKRP in Cincinnati, Gimme a Break!, Newhart, Moonlighting, Family Ties, Day by Day, Major Dad, Phenom, The Boys are Back, Dharma & Greg, Everybody Loves Raymond, Scrubs, and Reba. He also directed the 1989 romantic comedy Worth Winning.