Novelist, playwright and stage actor who adapted the play "Brown of Harvard" to the screen in 1926. Stewart arrived in Hollywood in 1930 and began turning out scripts noted for their polish and satirical wit, particularly the sophisticated costume drama, "The Prisoner of Zenda" (1937), and the swank romantic comedy, "The Philadelphia Story" (1940). He joined the Hollywood Anti-Nazi league and wrote the anti-fascist script for "Keeper of the Flame" (1942) which later led to his being blacklisted in the early 1950s. The following year Stewart moved to England, where he wrote scripts and, in 1970, an autobiography.