Best known for his role as Gomez Addams on TV's The Addams Family, he also starred in ABC's I'm Dickens, He's Fenster and in the second season of Batman in the villainous role of the Riddler.
He was initially a math major in college at Washington & Jefferson before transferring to Johns Hopkins.
He is known for playing eccentric characters and started out playing these kinds of roles in theater.
He married his first wife, Suzanne Hahn in 1956, and the couple had three sons.
He is known for his role in the comedy film, Evil Roy Slade, along with co-star Mickey Rooney.