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      Justin is a Senior Writer at Gumroad and Instructor of the 10x Creator Course. Previously, he served as Director of Communication and speechwriter to senior U.S. officials, including SecDef Jim Mattis, SecDef Leon Panetta, and General (Ret.) David Petraeus. He was also an Evangelist at Palantir and served as a certified nuclear engineer aboard a U.S. Navy fast-attack submarine.