Ray Dalio 

Ray Dalio is the billionaire founder of Bridgewater Associates, one of the world’s largest hedge funds. He grew up in a middle-class neighborhood on Long Island and began playing the stock market at age 12. He started Bridgewater out of his apartment in New York in 1975 and enjoyed some success until 1982, when he predicted an imminent depression, bet on it, and plunged his firm into serious trouble. After laying off most of his employees, and with the help of a $4,000 loan from his father, he began again and built his company to a financial powerhouse managing over $150 billion.