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Meet Y Combinator's Bold Whiz Kid Boss

This story appears in the May 2015 issue of Entrepreneur. Subscribe »

firm defied expectations when it replaced co-founder and longtime president Paul Graham with Sam Altman, the whiz kid behind social networking app Loopt. A year into his tenure, Altman continues redefining his firm's identity, making bigger and bolder bets on startups from across the spectrum. Meet the new boss.

Gabriela Hasbun

It was mid-2012, and it was time for a change. Computer programmer and entrepreneur Paul Graham realized that Y Combinator, the influential venture capital firm and seed-stage accelerator he co-founded in 2005, needed to expand its horizons to keep pace with the explosive growth of the global startup culture. Graham also recognized that he was not the one to spearhead this next phase in the firm's life cycle, so he began taking steps to relinquish his presidency and identify a successor.

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