Harold Rowe "Hal" Holbrook, Jr. (born February 17, 1925) is an American film and stage actor. Holbrook initially gained notoriety for a one-man stage show he developed while in college in 1954, performing as Mark Twain.He made his film debut in Sidney Lumet's The Group (1966). He later gained international fame for his performance as Deep Throat in the 1976 film All the President's Men. He was known for his role as Abraham Lincoln in the 1976 television series Lincoln.