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Brother of Brad Grunberg. Auditioned for the role of Fred Flintstone in The Flintstones in Viva Rock Vegas. He has known J.J. Abrams since they were in kindergarten. Greg has gotten parts in almost every project J.J. works on. Acted in several high-profile television commercials early on in his career, including one that was so memorable it landed him on "The Tonight Show." Created and ran a successful frozen yogurt delivery service.