Appelbaum is from a Jewish family. He attended the Riverdale Country School with longtime writing and producing partner André Nemec. He then went on to attend New York University's Tisch School for the Arts.
Appelbaum has written for shows such as Life on Mars, October Road, and the series Happy Town. He has also been a co-producer and screenwriter for such films as Mission: Impossible – Ghost Protocol.
He frequently collaborates with a tightly knit group of film professionals which include J. J. Abrams, Damon Lindelof, Adam Horowitz, Alex Kurtzman, Roberto Orci, Edward Kitsis, Andre Nemec, Jeff Pinkner, and Bryan Burk.

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