While Tiger’s success was the driving force behind the change, the tipping point may have been Ernie Els’ victory in the British Open in 2002. Helped by Jos Vanstiphout, Els cruised to victory at Muirfield, St. Andrews. That spurred changes. Today, more and more sports psychologists are advising golfers about golf’s mental side. They’re also writing books about it. One noteworthy book is Tim Gallwey’s The Inner Game of Golf, fashioned after his breakthrough book, The Inner Game of Tennis.