Kostis is a golf instructor. Among his many students are Paul Casey, Chez Reavie, Bernhard Langer, Steve Elkington, Dan Marino, Maury Povich, and Mike Schmidt. He has the Peter Kostis Learning Academy at Grayhawk Golf Club, Scottsdale AZ Kostis also was the instructor who coached Kevin Costner in the movie "Tin Cup".
He lives with his wife, Sandy, and their two children in Paradise Valley, Arizona.
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