 Marks was Barry Malkin's assistant editor on "The Rain People" (1969), which was directed by Francis Ford Coppola early in his career.He then assisted Dede Allen on "Alice's Restaurant" (1969) and on "Little Big Man" (1970); he co-edited "Serpico" (1973) with Allen.Dede Allen was among the most prominent film editors of her generation, and she was known for helping to develop the careers of several younger editors.