CURRENT BIOGRAPHY July 1977 (The H.W. Wilson Company) Robert Duvall has served a long yeomanry in a myriad of stage, screen, and television character roles, from the retarded neighbor who frightens but eventually saves the children in the film To Kill a Mockingbird (1963) to the mob's counselor in the Paramount blockbuster The Godfather (1972), a role for which he won the New York Film Critics A..