His films used a variety of names for the production company such as "Alco", "Alson", "Alplee" and "National Pictures".
His son Edward Jr. shared in the producer's duties on these films and composed or co-wrote the musical score for some of them.
Finishing with Fox after September Storm (1960), Alperson acquired distribution rights to a pair of Japanese science-fiction films, The Last War and The Human Vapor.
He later (1963) acquired the film rights to director Billy Wilder's Irma La Douce—his last project of note—for Mirisch Productions but without the music.
Alperson had made an agreement with Mirisch for 25% of the profits of the film and won his case in court when there were problems with the arrangements.