- Father was a singer; mother was a harpist and dancer.
- Starred in a radio adaptation of Oliver Twist at age 10 and became a professional actor in a touring troupe at age 17.
- Worked as an elevator operator at the Waldorf-Astoria Hotel in New York City.
- Nominated for two Tony Awards.
- Memorable film roles include kindhearted Friar Laurence in 1968's Romeo and Juliet and unhinged scientist Durand Durand in 1968's Barbarella. (The latter character inspired the rock-group name Duran Duran.)
- Appeared in TV's Cheers, The Golden Girls and The West Wing.
- Acting career spanned from the 1950s to the 2000s.
- 1968, Tony — Actor (Dramatic): Nominee
- 1982, Tony — Actor (Play): Nominee
- 1968, BAFTA Film Awards — Most Promising Newcomer to Leading Film Roles: Nominee
- Maureen Toal — Ex-wife
- Steven O'Shea — Son
- Kitty Sullivan — Wife
- Colm O'Shea — Son
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