He appeared in various films in the 1940s before landing the role of Peter Sands, the boss of Susan Camille MacNamara (Ann Sothern) on the 1950s sitcom Private Secretary. A retooled version of the series appeared later, titled The Ann Sothern Show. It featured many of the same actors, including Porter as hotel manager James Devery, in the venue of a fashionable New York City hotel. He later guest starred on episodes of Green Acres, Love, American Style, The Mod Squad, Barnaby Jones, The Six Million Dollar Man, Hawaii Five-O, Three's Company (on which he played Jack Tripper's uncle), and Switch. Porter also had a lucrative stage career that included the long-running hit Any Wednesday (1964) opposite Sandy Dennis and Gene Hackman.