Andrew Ng

Massive open online courses (MOOCs) are all the rage these days, and Stanford computer scientist Ng's Coursera is the world's leading provider of them. More than 4.5 million people have signed up for Coursera's 400-plus MOOCs, and the company has raised $43 million this year--bringing its funding to $65 million from backers including Kleiner Perkins Caufield & Byers and the World Bank.