Amazon just announced a major shake-up to its senior ranks, with Jeff Bezos' second-in-command replacing him later this year. Here are the other high-powered executives behind some of the biggest CEOs in tech.
Mike Blake/Reuters; Mark Ralston/AFP/Getty Images
Life at the top of the world's most valuable tech companies isn't easy. For CEOs at companies like Apple or Amazon, it means long days and a lot of pressure.
Luckily, most CEOs don't go it alone: they have a second-in-command, a high-level executive who may shoulder some of that burden. Some of these execs may go on to run the company one day - others may leave for big opportunities elsewhere.
Some chief ex...