This is biography of the life and death of Ernest Miller Hemingway, who was a writer, soldier, spy, big game Hunter, foreign correspondent, deep sea fisherman, boxer, bare knuckle brawler, and a hard drinker. He wrote twenty-two books, had four wives, experienced four wars, and won one Nobel prize. Ernest Hemingway changed American literature; in his writing, everything is reduced to its purest form. The style of his writing did not emerge from a college education, but was developed from self- education, hard work and life experience. The cause of Hemingway’s suicide was not from hereditary traits but was due to brain damage resulting from his adventurous lifestyle, Chronic traumatic Encephalopathy (CTE), a medical condition not discovered until fifty-three years after his death. This biography differs from others; the author met Hemingway, followed his adventures, and became familiar with chronic traumatic Encephalopathy through the deaths of fellow pro-football players from brain injuries. Hemingway received brain damage from numerous concussions resulting from incidents of war, auto accidents, boxing, airplane crashes and electroshock treatments. More than any other Hemingway biography this work details his life as a spy in China, exploits during the Spanish Civil War, leading partisans in world war II, his court marshal and the many concussions that triggered his suicide.