Born in Paris, France, Kaplan is the son of film composer Sol Kaplan and actress Frances Heflin, the nephew of actor Van Heflin, and the brother of actresses Nora Heflin and Mady Kaplan.
Kaplan lived in Hollywood until 1954, when his father had to move to New York after being blacklisted.
Kaplan started his career as a child actor in the Broadway production of The Dark at the Top of the Stairs directed by Elia Kazan. He was in a 1964 off-Broadway production Rumplestillskin by Elaine May.

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