Trivia

In July 1971, Michael O'Sullivan was found dead in his San Francisco apartment at the age of 37, a bottle of sleeping pills by his side. It is not known whether his death was accidental or a suicide.

Was nominated for Broadway's 1966 Tony Award as Best Supporting or Featured Actor (Musical) for "It's a Bird...It's a Plane...It's Superman!"

Sullivan won the Obie and the Laura D'Annunzio Awards in 1963, for his portrayal of the Director in Pirandello's Six Characters in Search of an Author, directed by William Ball.

Raised in Phoenix, Arizona, but lived most of his adult life in San Francisco, California.