The Outsiders ⇥ economist.com

Speaking of Tim Cook, a chart was posted to the online edition of The Economist today, which shows that:

outsiders are almost twice as likely as insiders to be given the boot, and have a much poorer record of making money for their shareholders than insiders.

This I got from a comments thread on Hacker News in which Joseph Flaherty notes three instances of great performance by successors to defining CEOs.