248. Kenneth Langone
$3.1 billion self-made score: ( source: investments age: 82 residence: sands Point, n.y. m.b.a., nyu stern ’60 Home Depot’s investment banker is one of the biggest donors to NYU. Langone, who got his M.B.A. at NYU, attending at night while working on Wall Street during the day, contributed $10 million to the school’s part-time M.B.A. program in 1999; the medical center was named for him after he pledged $200 million in 2008. He also helped take Ross Perot Sr.’s Electronic Data Systems public in 1968 before forming his own investment firm, Invemed Associates.