15. Warren Buffett, 86, considered to be one of the most successful investors in the world, and as of March 2017 is the second wealthiest person in the United States with a total net worth of $78.7 billion. Buffett has been the chairman and largest shareholder of Berkshire Hathaway since 1970, and his business exploits have had him referred to as the "Wizard", "Oracle" or "Sage" of Omaha by global media outlets. He is noted for his adherence to value investing and for his personal frugality despite his immense wealth. Buffett is a notable philanthropist, having pledged to give away 99 percent of his fortune to philanthropic causes, primarily via the Bill & Melinda Gates Foundation. (Photo by Charles Sykes/Invision/AP)
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