Waldhorn was born in London on 3 July 1943 to Liselotte ( Popper) and Siegfried Waldhorn. His parents were Austrian Jews. He studied acting at the Yale School of Drama (graduated 1967) where he notably performed in new works written by playwright Lillian Hellman in 1966.
Waldhorn, born in London on July 3, 1943, to Liselotte (Popper) and Siegfried Waldhorn, was an Austrian Jewish individual who studied acting at the Yale School of Drama, graduating in 1967. He is known for his performances in new works by playwright Lillian Hellman during his time at Yale.