324. Jonathan Gray
$2.5 billion Self-made Score: ^ Source: investments age: 47 residence: new York city
B.a., B.S., u. of Pennsylvania ’92
The mastermind behind private equity giant Blackstone’s $104 billion (in assets) real estate portfolio, Gray got a job at the firm right after he graduated from the University of Pennsylvania, where he studied English and economics and aspired to become a journalist. He credits some of his success to his college years. He worked at the rare-books library and also as a guard checking IDS at a graduate-student dorm. He met his wife, Mindy, in a Romantic poetry class. The couple has given over $60 million to programs supporting kids in low-income families, including building health clinics in public schools and helping families start college savings accounts.