Salman Khan of Khan Academy AMA on reddit
Just wanted to mention that if any of this sounds interesting, Khan Academy is hiring both for full-time devs and interns. Here's the job post:  Mountain View - Khan Academy (full-timers and interns welcome year-round)

  Our mission is to provide a world-class education to anyone, anywhere. We
  already have millions of students learning every month, and we're growing
  quickly.

  Our students answer over 1.2 million math exercise problems per day, all
  generated by our open source exercise generation framework

(http://github.com/khan/khan-exercises, http://ejohn.org/blog/khan-exercise-rewrite/)  and Sal's videos have been viewed over 99 million times. We're just getting
  started feeding this data we're collecting back into the product to help our
  users learn more. If you're interested in data, analytics, and education,
  this is a dream gig.

  Plus, it's one of the highest educational impact positions you can imagine.

  We're hiring all types of devs -- mobile, frontend, backend, whatever you
  want to call yourself. Big plans ahead.

http://www.khanacademy.org/jobs