Joshua Kushner

While an undergraduate at Harvard, Kushner cofounded the social-gaming platform Vostu out of his dorm room; now it's the largest company of its kind in Latin America, with 35 million registered users and close to 600 employees. Having proven himself as an entrepreneur, Kushner—the youngest member of the wealthy clan that also includes his father, Charles, a New Jersey real-estate magnate, and his brother, Jared, the owner of the New York Observer and (Donald Trump's son-in-law)—turned his sights in 2009 to venture capitalism, founding the angel fund Thrive Capital. The company has since invested in nearly 25 start-ups, including the group-messaging service GroupMe, the online art emporium Art.sy, and the crowd-funding platform Kickstarter. Kushner also recently attended Harvard Business School