41. Ken Griffin
« 40. Martha Lavey42. Paul Kahan » 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 … Read more
