Sal Khan

Sal Khan is the founder and one-man faculty of the Khan Academy (www.khanacademy.org), a nonprofit with the mission of providing free, high-quality education to "anyone, anywhere" in the world. A former hedge fund analyst with degrees from MIT and Harvard, Khan was helping a young cousin with math in 20014, communicating by phone and using an interactive notepad. When others expressed interest, he began posting videos of his hand-scribbled tutorials on YouTube. Demand took off, an in 2009 he quit his day job.

The Khan Academy website now provides self-pacing software and unlimited access to over 2,500 instructional videos on its YouTube channel covering everything from basic arithmetic to college level science and economics. It's the most-used library of educational videos on the web, with two million unique students per month, over 70 million lessons delivered, and over 100 million exercises completed. A growing number of classrooms around the world are using Khan Academy to help build student mastery of topics and to free up class time for dynamic project based learning.