German-born Web entrepreneur who co-founded PayPal and ran a venture capital firm.
He was a nationally ranked junior chess champion.
He was one of the first major investors in Facebook, buying a 10 percent stake in 2004 for $500,000.
His family moved from Germany to the U.S. when he was a toddler.
He co-founded PayPal with Max Levchin, with whom he co-produced the movie Thank You for Smoking from 2005.