With artist Ramona Fradon, he reintroduced the 1940s Golden Age superhero Aquaman in Adventure Comics #260 (May 1959)[7] and scripted through at least #282 (March 1961), introducing major characters along the way.

[9] Bernstein and artist George Papp introduced the Phantom Zone and General Zod into the Superman mythos in Adventure Comics #283 (April 1961).

Bernstein co-created Iron Man supporting characters Pepper Potts and Happy Hogan in Tales of Suspense #45 (Sept. 1963) with Stan Lee and Don Heck.

In 1951, when he co-founded the Roslyn Music Group, presenting chamber-music ensembles and soloists on Long Island, his concert career as an impresario was underway.

[2] Bernstein's one-act plays received a posthumous performance in 1993 at the Arena Players Repertory Theater in East Farmingdale, Long Island.

At age 69, he died of heart failure at his Delray Beach, Florida, winter home, survived by his wife, Beverly, of Upper Brookville; his daughter, Alison, of Manhattan; and his sister, Louise Sandler, of Elkins Park, Pennsylvania.