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After reading 1506 websites, we found 2 different results for "Who wrote American Sniper: The Autobiography of the Most Lethal Sniper in U S Military History"
Chris Kyle
The movie is an adaptation of American Sniper: The Autobiography of the Most Lethal Sniper In US Military History, by Chris Kyle, Scott McEwen and Jim DeFelice.
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Kyle
Kyle was discharged from the US Navy in 2009 and later wrote the autobiographical book American Sniper: The Autobiography of the Most Lethal Sniper in US Military History, which quickly became a bestseller and inspired the aforementioned movie from Clint Eastwood.
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