Mulcahy, the CEO of Xerox

Mulcahy was named Fortune's hottest turnaround act since Lou Gerstner. She and her top people learned the nitty-gritty of every part of the business. Mulcahy told everyone the cold, hard truth they didn't want to know. In fact, she'd wake up in the middle of the night worrying about what would happen if the company folded.