Ken Griffin

AGE: 43
OCCUPATION: Founder and CEO, Citadel

The $11.5 billion hedge fund he runs returned 20 percent in 2011, trouncing his competition and burnishing his reputation as one of the sharpest operators in the business. Griffin pours his wealth not only into impressionist art (he’s on ARTnews’ list of the world’s top 200 collectors) but also into Chicago philanthropy (schools and art museums) and politics (he has funded both Republican and Democratic candidates).

MORE ON GRIFFIN: The File on Citadel’s Ken Griffin

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Photograph: Bill Hogan/Chicago Tribune