A great American hero-a 20th-century warrior and military strategist who lived outside the spotlight but whose work has been enormously influential-is brought brilliantly to life in this acclaimed biography. John Boyd was the finest fighter pilot in American history. From the proving ground of the Korean War, he went on to win notoriety as the instructor who defeated-in less than 40 seconds-every pilot who challenged him. But what made Boyd a man for the ages was what happened after he left the cockpit. He transformed the way military aircraft-in particular the F-15 and F-16-were designed with his revolutionary Energy-Maneuverability Theory. Boyd dedicated his later years to a radical theory of conflict that was largely ignored during Boyd's lifetime, but that is now widely considered to be the most influential thinking about conflict since Sun Tzu's The Art of War.