Trivia

Went to high school and was friends with Kareem Abdul-Jabbar.

In The Super (1972), he played the son of Richard S. Castellano, who just the year before had played Clemenza in The Godfather (1972). Kirby went on to play the young Clemenza in The Godfather Part II (1974).

Received a special tribute as part of the In Memoriam tribute at The 79th Annual Academy Awards (2007).

He and father Bruce Kirby were both born on April 28.

He has appeared in three films that have been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: The Godfather Part II (1974), This Is Spinal Tap (1984) and When Harry Met Sally... (1989).

Both he and his father Bruce Kirby were on the same episode of Columbo, By Dawn's Early Light aired Oct 27, 1974.

He and father Bruce Kirby both appeared in episodes of M*A*S*H (1972).

Son of Bruce Kirby (whose real first name is Bruno), stepson of Roz Kirby. Brother of John Kirby and step-brother of Brad Sullivan.

Was allergic to horses.