Driven by the mission to provide first-class, personalized education to students all over the world, Khan Academy has more than 500,000 registered teachers and has delivered over 400 million lessons. The nonprofit organization provides free online materials and resources - like practice exercises and instructional videos - to help people of all ages learn a wide range of subjects. But as the staff of contributors grew (and the lecture library did too) it was clear they needed a new solution that could keep up with the company's rapid growth.