Most famous for his one-man show, Mark Twain Tonight.
During World War I, he served in the United States Army.
He played Abraham Lincoln in the 70s and was nominated for awards for Into the Wild.
He got married to Ruby Holbrook on September 22, 1945, then to Carol Eve Rossen on December 28, 1966, and to Dixie Carter on May 27, 1984.
He depicted Abraham Lincoln once during his talk show.