Jack Coughlin, a retired U.S. Marine gunnery sergeant, is the author, with Casey Kuhlman and Donald A. Davis, of the New York Times bestseller, Shooter: The Autobiography of the Top-Ranked Marine Sniper (St. Martin's), as well as the novel, Kill Zone (St. Martin's) with Donald A. Davis. He lives in southern California, where is raising his two daughters.

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