In 1939, Homer Kelley played golf for the first time and scored 116. Frustrated, he did not play again for six months; when he did he carded a 77. Determined to understand why he was able to shave nearly 40 strokes off his score, Kelley spent three decades of trial and error to unlock the answer and to recapture that one wonderful day when golf was easy and enjoyable. In 1969, Kelley self- published his findings in The Golfing Machine: The Computer Age Approach to Golfing Perfection.

The bestselling instruction books of the day required golfers to conform their swings to the author's ideals, but Homer Kelley configured swings to fit every golfer. He found an enthusiastic disciple in a Seattle teaching pro named Ben Doyle, who in turn found an eager student in 13-year-old prodigy Bobby Clampett. Clampett's initial success in amateur golf shined a bright spotlight on Homer Kelley and The Golfing Machine, but when the young star suffered a painfully public collapse and faltered as a pro, critics were quick to blast Kelley and his complex and controversial ideas. With exclusive access to Homer Kelley's archives, author Scott Gummer paints a fascinating picture of the man behind the machine, the ultimate outsider who changed the game once and for all of us.