7. Warren Buffett
One of the world’s most successful investors and the second-wealthiest person in the U.S., with a net worth estimated at $76 billion, Omaha native Buffett started making money young, delivering newspapers and selling golf balls and chewing gum.
After attending the University of Nebraska and the Columbia Business School, Buffett worked as a stockbroker, beginning his investment company in 1956.
In 1962, Buffett invested in, then took over failing textile company Berkshire Hathaway, which the Oracle of Omaha turned into a highly successful conglomerate with holdings that include some of the world’s biggest brands, using his value-investment method.