 During this time, Stewart also wrote and directed theatre in New York and London.He worked as a screenwriter in Los Angeles, where he became a lifelong friend of Philip Ives Dunne, the first screenwriter to receive a star on the Hollywood Walk of Fame, and a strong and vocal opponent of the Hollywood Blacklisting of the 1950s.Stewart gave the dedication speech for the Writer's Guild Theatre when it was named in Dunne's honor.