D'entre a suya amplisma filmografía como guionista, con mas de 70 colaboracions, se puet mencionar bell un d'os suyos guions, ta cintas como Scarface (1932, Howard Hawks y Richard Rosson, con un guión escrito en nomás que onze días), Twentieth Century (1934, Howard Hawks), Viva Villa! (1934, Jack Conway), Barbary Coast (1935, Howard Hawks), Nothing Sacred (1937, William A. Wellman), Gone with the Wind (1939, Victor Fleming, no acreditato), Gunga Din (1939, George Stevens), Wuthering Heights (1939, William Wyler), His Girl Friday (1940, Howard Hawks), Spellbound (1945, Alfred Hitchcock), Notorious (1946, Alfred Hitchcock), Duel in the Sun (1946, King Vidor, no acreditato), Monkey Business (1952, Howard Hawks), The Indian Fighter (1956, Andre De Toth), A Farewell to Arms (1957, Charles Vidor), Mutiny on the Bounty (1962, Lewis Milestone), Cleopatra (1963, Joseph L. Mankiewicz, no acreditato) u Casino Royale (1967, Ken Hughes, John Huston, Joseph McGrath, Robert Parrish y Val Guest, postuma).