Born in Dublin, Ireland, he was a prominent stage and film actor known for his work with the Abbey Theatre. He fought in the Easter Rising of 1916 before moving to the United States, where he transitioned to Hollywood. Over his career, he appeared in numerous films, often portraying Irish characters, and was noted for roles in John Ford's films like "The Quiet Man" and "How Green Was My Valley." His performances were marked by a strong presence and authenticity, deeply rooted in his Irish heritage.