Ten years ago, Salman Khan, with three degrees from MIT and an MBA from Harvard, agreed to help tutor his cousin Nadia, who was struggling in math. Using Yahoo's Doodle notepad, Khan offered Nadia a sequence of mini lessons designed to scaffold her learning. Over time, other friends and relatives heard about Khan's success and asked for similar help. He uploaded videos to YouTube for them that ended up drawing many views and comments. At this point, Khan began to see an idea that could revolutionize education. In 2009, he quit his job as a hedge fund analyst and started Khan Academy--a nonprofit educational organization offering free online lessons to anyone interested. With backing from the Bill & Melinda Gates Foundation and, then, Google, Khan Academy has grown from a one-man shop into an international center for learning, with thousands of resources, lessons, and lectures. This article presents an interview with Salman Khan, where he discusses where he thinks we are in the process of rethinking education for the 21st century, and his vision for the future.