Warren Buffett‘s enduring success secret has been revealed by a Harvard University expert, offering a unique insight into the legendary investor’s approach. What Happened: Bill George, a leadership expert at Harvard University, has identified a crucial factor that has contributed to Buffett’s extraordinary success, reported CNBC Make It. George, who is also a former CEO of Medtronic, believes that Buffett’s ability to find the “sweet spot” between doing something he’s good at and something he enjoys has been the key to his success. “To be truly successful, to do anything great, you have to use…