"There’s a very strong ethic and philosophy at Khan Academy about openness," says Kohlmeier, who works for Khan Academy pro bono, having left a lucrative post as president and co-founder of a proprietary trading firm that employed 30 people. “That’s the M.O. that I intend to follow," he says. "I would not be at Khan Academy if Khan Academy were not a nonprofit.”
Where can I download the source?