American stage-actor Oscar O'Shea made his first screen appearance in the 1937 MGM musical Rosalie. O'Shea spent most of the rest of his movie career as an MGM utility player. One of his best-remembered roles, however, was for producer Hal Roach: O'Shea appeared as the ranch boss in 1939's Of Mice and Men. Otherwise, Oscar O'Shea was generally consigned to one- or two-scene roles, usually as salty sea captains.