Thomas John Mitchell (Irish: Tomás Séan Mistéal; July 11, 1892 – December 17, 1962) was an American actor, writer, and theatre director. He is considered one of the great character actors of Golden Age of Hollywood and a leading man on Broadway, and was the first male actor to gain the Triple Crown of Acting by winning an Oscar, an Emmy, and a Tony Award. He appeared in over 115 film and television roles between 1923 and 1961, along with numerous stage appearances. Among Mitchell's most famous film roles in a long career are those of Scarlett O'Hara's father Gerald O'Hara in Gone with the Wind, alcoholic Doc Boone in Stagecoach (1939), Uncle Billy in It's a Wonderful Life, Pat Garrett in The Outlaw, and Mayor Jonas Henderson in High Noon. Mitchell won an Academy Award for Best Supporting Actor for his performance in Stagecoach, with a previous nomination in the same category for The Hurricane (1937). He was nominated for three Primetime Emmy Awards for Best Actor in a Drama Series: in 1952 and 1953 for his role in the medical drama The Doctor—winning in 1953—and in 1955 for an appearance on a weekly anthology series. He won a Tony Award for Best Actor in a Musical in 1953 for his role as Dr Downer in the musical comedy Hazel Flagg. (Via Wikipedia)