President, UnitedHealthcare and EVP, UnitedHealth Group
UnitedHealth Group (UNH)
2008 rank: 45
Age: 49
She's a rising star in a brutally competitive business. UNH hired her last year to run its largest division, which generates half the company's $81.2 billion in revenue.
NEXT: 39. Meredith Whitney
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Wilderott...