Collins turned his attention to radio, where he was involved in 18 broadcasts a week, sometimes working as many as 16 hours a day. He also played parts in short films, starting in 1930, including the Vitaphone Varieties series based on Booth Tarkington's Penrod stories. In 1934, Collins began a long association with Orson Welles, which led to some of his most memorable roles. They met when Welles joined the repertory cast of The American School of the Air, his first job in radio. In 1935, Welles won a place in the prestigious company that presented the news dramatization series The March of Time—an elite corps of actors, including Collins, Agnes Moorehead, Everett Sloane, and Paul Stewart, who would soon form the core of Welles's Mercury Theatre. On radio, Collins was in the distinguished repertory cast of the weekly historical drama Cavalcade of America for six years. Collins and Welles worked together on that series and others, including Welles's serial adaptation of Les Misérables (1937) and The Shadow (1937–1938). Collins became a member of the repertory company of Welles's CBS Radio series The Mercury Theatre on the Air (1938) and its sponsored continuation, The Campbell Playhouse (1938–1940). Through the run of the series, Collins played many roles in literary adaptations, including Squire Livesey in "Treasure Island", Dr. Watson in "Sherlock Holmes", and Mr. Pickwick in "The Pickwick Papers". Collins's best-known (albeit uncredited) work on this series, however, was in "The War of the Worlds", the celebrated broadcast in which he played three roles, most notably the rooftop newscaster who describes the destruction of New York. Along with other Mercury Theatre players, Collins made his feature-film debut in Citizen Kane (1941), in which he portrayed ruthless political boss Jim W. Gettys. He appeared in Welles's original Broadway production of Native Son (1941) and played a principal role in Welles's second film, The Magnificent Ambersons (1942). His ongoing radio work included Welles's wartime series, Ceiling Unlimited and Hello Americans (1942), and the variety show The Orson Welles Almanac (1944). Having returned to his native California, Collins appeared in more than 75 major motion pictures, including Leave Her to Heaven (1945); The Best Years of Our Lives (1946); Crack-Up (1946); A Double Life (1947); two entries in the Ma and Pa Kettle series; and the 1953 version of The Desert Song, in which he played the nonsinging role of Kathryn Grayson's father. He