Luis von Ahn
Louis von Ahn is an Associate Professor of Computer Science at Carnegie Mellon University, and he's at the forefront of the crowdsourcing craze. His work takes advantage of the ever-growing Web-connected population to achieve collaboration in unprecedented numbers. His projects aim to leverage the crowd for human good. His company reCAPTCHA, sold to Google in 2009, digitizes human knowledge (books), one word at a time. His new project, Duolingo, aims to get 100 million people translating the Web in every major language.