- Father of playwright David Hirson ("La Bete", "Wrong Mountain").
- Has two children from his former marriage to actress Alice Hirson: David Hirson and Christopher Hirson.
- He graduated from Friends Seminary, a private Quaker school in New York, and then enlisted in the Army, serving in Europe during WWII. While on leave, he went to England, attending performances by Laurence Olivier that piqued his interest in theater. He earned a bachelor's degree in English at Yale.
- He was the son of Hazel (Ablowich) and Max Mortimer Hirson. He was of Russian Jewish descent.
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