 He was the brother of Walter Mirisch and the half-brother of Harold Mirisch, who were also film executives; and the half-brother of Irving Mirisch, who ran a company which supplied candy to movie theatres.In 1953, he moved to Los Angeles to join his brothers Harold and Walter at Monogram Pictures, later known as Allied Artists.In 1957, they founded The Mirisch Company, one of the leading independent production companies.