In 1960, he appeared in one of his best-remembered roles as private investigator Milton Arbogast in Alfred Hitchcock's "Psycho". Along with Gregory Peck and Robert Mitchum, Balsam appeared in both the original "Cape Fear" (1962), and the 1991 Martin Scorsese remake. He won an Academy Award for Best Supporting Actor for his role as Arnold Burns in "A Thousand Clowns" (1965). Balsam also performed the original voice of the HAL 9000 computer in "". After his lines were recorded, director Stanley Kubrick decided "Marty just sounded a little bit too colloquially American," and hired Douglas Rain to perform the role for the released film.