In 2009, when merely tens of thousands of people were watching his videos every day, he realized his hobby could - and should - be his life's calling. He quit his job and founded the Khan Academy, a non-profit dedicated to "providing a free world-class education for anyone anywhere," according to the company's website, KhanAcademy.org.
He's been hailed as a major innovator in education by luminaries such as Secretary of Education Arne Duncan and Bill Gates. And this month, he's on the cover of Forbes Magazine. (http://www.forbes.com/sites/michaelnoer/2012/11/02/one-man-one-computer-10-million-students-how-khan-academy-is-reinventing-education/)
On Tuesday, he'll be speaking about reinventing education at a sold-out presentation and question and answer session at Cal Poly Pomona.
His videos are available online at YouTube.com/KhanAcademy.