 In 1942, he co-starred on Broadway in A Kiss for Cinderella, a play by J.M. Barrie, the creator of Peter Pan. And the following year, he was signed to a movie contract and would be seen in A Bell for Adano, Dragonwick, Forever Amber, and The Snake Pit, in which he played one of the psychiatrists looking after a mental patient portrayed by Olivia de Havilland in an Oscar-nominated role. Well, the following year, Glenn Langan would star as Edmond Dantes in the 1949 motion picture Treasure of the Monte Cristo.