First to come to mind is Lou Gerstner, who turned around IBM. I read his autobiography about the experience - crazy stuff. He was up against so much built up gunk and bureaucracy, that only an outsider could've broken.
http://en.wikipedia.org/wiki/Louis_V._Gerstner,_Jr.#IBM
http://www.amazon.com/Elephants-Dance-Inside-Historic-Turnar...
"""Gerstner quarterbacked one of history's most dramatic corporate turnarounds. For those who follow business stories like football games, his tale of the rise, fall and rise of IBM might be the ultimate slow-motion replay. He became IBM's CEO in 1993, when the gargantuan company was near collapse."""
From one of the reviews here http://www.amazon.com/Elephants-Dance-Inside-Historic-Turnar...
http://www.amazon.com/Elephants-Dance-Inside-Historic-Turnar...