He wrote other westerns for Stuart Heisler (Tulsa), for Robert Wise (Two Flags West), for Raoul Walsh (The Tall Men), and for Phil Karlson (They Rode West and Gunman's Walk).
His screenplays in other genres include The Red Beret, North West Frontier, Trouble in the Glen, The Quiet Man, The Rising of the Moon), and Donovan's Reef.