Born in Brooklyn, New York, Post started his career in 1938 working as an usher at Loew's Pitkin Theater. He abandoned plans to become an actor after training with Tamara Daykarhanova, and turned to directing summer theatre. Post taught Acting and Drama at New York's High School of Performing Arts in 1950. He persuaded his friend, Sidney Lumet, to do likewise.
Success in the theater led to work in television from the early 1950s. Post directed episodes of many series including Gunsmoke, Perry Mason, Wagon Train, Rawhide, The Twilight Zone, Columbo and 178 episodes of Peyton Place. He also directed TV films (including the original Cagney and Lacey film-of-the-week).
Post directed the 2001–02 Festival of the Arts at the Bel-Air University of Judaism (now the American Jewish University).
Post died at the UCLA Medical Center, Santa Monica, California on August 20, 2013.
