
Age: 53
McDonald's stock just keeps climbing, up 15% over the past 12 months. A 30-year McDonald's veteran and a recent appointee to the Monsanto board, Fields oversees operations for all 14,000 U.S. stores. She's implementing the largest expansion of the menu in 30 years and has seen early success with McDonald's range of coffee drinks.
NEXT: Melanie Healey
Last updated October 16 2008: 10:16 AM ET