- Brother of Harry Cohn and Nat Cohn
- Father of Robert Cohn and Ralph Cohn.
- Treasurer of Columbia Pictures from 1925-27.
- In 1932 he led a shareholder's revolt to remove his brother Harry Cohn as production chief of Columbia Pictures, alleging that Harry's gambling addiction and other unpleasant habits threatened the stability of the company. Joe Brandt, president and co-founder of the studio, provided an unexpected resolution. Tired of playing mediator between the squabbling siblings, he abruptly sold all his interests to Harry, making him the undisputed top dog at Columbia. Neither Jack nor Harry accepted this outcome gracefully. From then on they only communicated with each other through intermediaries, and their feuding over business matters continued until Jack's death in 1956.
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