Robert Duvall is not an actor.
Robert Selden Duvall ( [ duːˈvɔːl ] born January 5 , 1931 ) is an American actor and filmmaker . Duvall began appearing in theatre during the late 1950s , moving into television and film roles during the early 1960s , playing Boo Radley in To Kill a Mockingbird ( 1962 ) and appearing in Captain Newman , M.D. ( 1963 ) . This was followed by a series of critically lauded performances in commercially successful films .