Warren Buffet - $72,700,000,000
Berkshire Hathaway, which owns companies like Geico, Dairy Queen and Fruit of the Loom, is now the fourth most valuable public company in the U.S.Lately he's also teamed up in various ways with 3G Capital-a firm run by several Brazilian billionaires-in deals for Kraft Foods, Heinz, Burger King and coffeehouse chain Tim Hortons. Going into the 2016 presidential elections, Buffett is one of Hillary Clinton's biggest proponents. He has long supported the former First Lady's bid to return to the White House-donating to her campaign and, perhaps more crucially, adding his stamp of approval. He has quietly become a big backer of Planned Parenthood and gun-control group Everytown for Gun Safety. In July Buffett gave away Berkshire stock worth more than $2.8 billion, bringing his lifetime giving to nearly $25.6 billion. Buffett says his best ever investment was buying Benjamin Graham's legendary book, "The Intelligent Investor," in 1949. He later studied under Graham at Columbia Business School. Buffett is known for his relative frugality, still living in the Omaha home he purchased for $31,500 in 1958.