Born to a large Irish Catholic family (the fifth of nine children) and raised in New York City, Lydon overcame a birth defect and alcoholic father to begin a Broadway career in 1937, acting opposite Van Heflin, Sidney Lumet and Uta Hagen in separate productions. After a number of films with Paramount and RKO, Lydon hit his stride in the "Henry Aldrich" B movie series of the early 1940s. After working increasingly in television in the early 1950s, Lydon turned to production roles, helping to create M.A.S.H. (1972) and 77 Sunset Strip (1958). He is still active as a producer and writer.
