 One of his major roles was "The Prophet" in "Operation Petticoat", alongside Tony Curtis and Gavin MacLeod.Dunn also appeared in several other well-known films, including "Giant", "Inherit the Wind", "The Long, Hot Summer", "The Kettles on Old MacDonald's Farm", and "Shenandoah".In another phase of his career, he appeared in a number of John Cassavetes films, including "Faces" and "A Woman Under the Influence".