Billionaire philanthropist Paul Tudor Jones is an iconic figure on Wall Street and has been called "one of the pioneers of the modern-day hedge fund industry." He runs Tudor Investment, the hedge fund he founded in 1980. His biggest claim to fame was predicting Black Monday, the famed stock market crash of 1987. Less than a year after his call, the market plunged more than 22%, marking the worst single-day decline since the stock market crash of 1929. Jones shorted the market, reaping a 200% gain for his hedge fund. So when Jones talks, Wall Street listens.