CEO, UnitedHealthCare, EVP UnitedHealth Group
UnitedHealth Group
2011 rank: 30
Age: 52
Wall Street likes UnitedHealth Group despite the regulatory turmoil in health insurance. Credit Boudreaux, who runs the $95-billion-a-year benefits business. Since she took the job in early 2011, UNH's stock is up 34%, while the sector climbed 27%.
For the latest on the most influential women in business, philanthropy, government, and the arts, like us on Facebook. 
