248. John Catsimatidis
$3.1 billion self-made score: ( source: oil, real estate age: 69 residence: new york city dropout, nyu The son of Greek immigrants, Catsimatidis worked as a clerk in a grocery store while attending NYU. He dropped out just short of graduating to work full-time in the business. He now owns New York City supermarket chain Gristedes. His daughter Andrea recently became the head of Manhattan’s Republican Committee.