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An actor and director on the New York stage, Warren B. Duff turned to screenwriting when he entered films in 1931. Long entrenched at Warner Bros., Duff wrote or co-wrote screenplays for such contractees as Dick Powell, Bette Davis and Warren William; he also contributed extensively to the output of James Cagney, working on the scripts of Cagney's Angels with Dirty Faces (1938), Each Dawn I Die (1939) and The Oklahoma Kid (1939). He worked at Paramount from 1940 through 1943, then moved next door to RKO, where he became the producer of such films as Experiment Perilous (1944), Lady Luck (1946) and Out of the Past (1947). Active into the TV era, Warren B. Duff was co-producer of the 1959 Ray Milland detective series Markham.