The longtime CEO of PotashCorp (now Nutrien), Bill Doyle led the Canadian fertilizer conglomerate when it helped produce half of the world’s food. He now serves as the chairman of Georgetown University’s board of directors, where he and his wife, Kathy, have also established the Doyle Program for Engaging Difference. He supports other education-related causes like the Evans Scholars Foundation, the Big Shoulders Fund, and his other alma mater, Loyola Academy. But long before he became one of Harvard Business Review’s top-rated CEOs, Bill got his start as a caddie, along Chicago’s north shore. In his Official Caddying Story, he shares many insights about how golf has shaped his life, including stories about Arnold Palmer, Bill Murray, Martin Sheen, and his 50-year friendship with Fred Blesi.

John O’Donnell is the founder of johnnie-O, a branded lifestyle apparel company that embodies living your best life. The johnnie-O brand has come to define west coast prep and can be found in most of your favorite golf pro shops as well as upscale retailers, like Nordstrom and Bloomingdales. But long before he sought to redefine your wardrobe with inventions like the “Tweener Button” and even before he played golf for the UCLA Bruins, John found his rhythm by caddying at one of Chicago’s most esteemed golf clubs. He even earned a spot caddying in the Western Open and is still friends with his former caddie master, Steve Mocogni. Enjoy learning how caddying helped shape one of the great gentleman players in the game of golf.

Fritz W. Corrigan is a businessman and philanthropist. While mostly retired, he still serves on a number of boards and mentors CEOs, while giving generously to causes like Dartmouth College and the Western Golf Association. Prior to that, he was the founding president and CEO of The Mosaic Company (NYSE: MOS), which he took public in 2004. Before Mosaic, Fritz spent the majority of his career at Cargill, Inc., where he last served as executive vice president, overseeing the fertilizer and salt businesses.

In some ways, Mike Keiser might be the Michelangelo of golf, though he’d never apply that label to himself. Through the creation of places like Bandon, Cabot Links, and Sand Valley, Mike’s company, Dream Golf, has left behind monuments that may easily last for centuries. But long before he created his first golf course, The Dunes Club, in 1988 and even before he built an empire from recycled greeting cards, Mike started working as a caddie in Upstate New York. And it was there that he developed a deep love for golf and learned many of the lessons that helped him chart his path. Caddies remain a central theme at his golf courses as well as his philanthropic efforts. Mike is a longtime thought leader for and director of the Western Golf Association, which just celebrated the first ever recipients of the Keiser Family Caddie Scholarship thanks to his generosity. He is also a member of the WGA’s Caddie Hall of Fame.