McMullin began his career directing national TV commercials. His feature Low Tide was released theatrically by A24 and his script First Harvest landed on the Black List. He has written films for Amazon, Sony, and is currently scripting Bomb for 20th Century Fox with Ridley Scott set to direct.

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Kevin received his B.A. from the University of Pennsylvania and M.F.A. from Columbia University, and is the founder of production co. Boy & Star in NYC/LA.