Hint: Youthful appearances to the contrary, this tech titan is better known for his hoodies than his ties. All sweetness in this picture, it's hard to imagine that he could spend a year eating only meat that he had killed himself. But it's almost harder to imagine that he -- or anyone -- would found a company that could see a $50 billion IPO before his 30th birthday.

Last updated October 24 2011: 2:34 PM ET
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They're the hottest young stars in business across the globe. They're innovators, disrupters, and job creators; in fact, it's a pretty safe bet you're going to be working for them someday -- if you aren't already!