Warren Buffett (net worth: $71 billion)

Nicknamed the “Wizard of Omaha,” Warren Buffett is the chairman and largest shareholder of Berkshire Hathaway, an Omaha, Nebraska-based investment company. Its assets include Geico, Clayton Homes, and MidAmerican Energy, as well as stakes in Coca-Cola, American Express, and Wells Fargo. Born in 1930, Buffett is married and has three children.