Upon hearing that Curly's absence temporarily halted production on the profitable Stooge shorts, Columbia Pictures president Harry Cohn forbade the ailing Stooge from taking any future time off to regain his strength.
He drew the attention of Columbia Pictures head Harry Cohn, who hired him to supervise the studio's feature film productions.
Before turning to film production in 1935, he first worked as fur trader for his father, since the late 1920s as an agent for William Morris, later as a talent agent and personal assistant to Harry Cohn.
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After Educational shut down its Hollywood studio, Lamont was hired by Columbia Pictures to work with such stars as Charley Chase and The Three Stooges, but his stay was short ("I had an intense hatred for Columbia's president Harry Cohn," said Lamont to authors Ted Okuda and Edward Watz).
When motion picture director Frank Capra fell ill with a mysterious fever after completing It Happened One Night, Columbia Pictures chief Harry Cohn called in Mason to diagnose and treat Capra's illness.