Born in New Jersey, he began making backyard movies as a teen. His films have been honored by the Student Academy Awards and the National Board of Review.

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McMullin's feature Low Tide was released theatrically by A24 and his script First Harvest landed on the Black List. Currently, Kevin is writing an original adventure film Kill The Beast for Amazon and adapting the fantasy manga Made In Abyss for Sony.

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