Larry Kirshbaum was the ultimate book industry insider—until Amazon called.

How a save-the-earth maker of solar-powered aircraft became the world's most prolific manufacturer of military drones.

The Valley's techies live in a bubble of prosperity. Optimism has its advantages, but some worry the region may lose touch with the rest of the world.

In his third act, Jobs led Apple on a run of success unprecedented in corporate history

SecondMarket and its ilk allow investors and employees—including Facebook's—to convert pre-IPO shares into millions. But is it healthy for startups?

Mark Zuckerberg's second-in-command provides "adult supervision" at the company, trying to keep growth at an optimum level.