Born in Philadelphia, he attended Syracuse U. After Pearl Harbor he left college to train on the Pennsylvania School Ship and then served in the merchant marine during WWII. After the war he did a brief stint in the aluminum business until he decided to become an actor. In New York, he landed numerous parts onstage and in the early era of live TV, and toured with “Tea and Sympathy” and The Warm Peninsula.”
Haddon had recurring roles on “Dennis the Menace,” “Dallas” (as J.R. ‘s banker), “Knots Landing,” “General Hospital” and most notably, “Mary Hartman, Mary Harman” where his non-stereotypical portrayal of a gay man was heralded as a first on national television. He continued to work onstage, performing at The Melrose in Los Angeles.
He is survived by his wife Jacqueline, son Michael, daughter Phoebe, stepson Guy, and grandchildren Zoe and Stephen.