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29. Pamela Nicholson
Pamela Nicholson
President and COO
Enterprise
2007 rank: 44
Age: 48

After almost 30 years at Enterprise, Nicholson became the company's first woman president in August. Revenue increased this year to $13 billion, from $9.5 billion, with the addition of Alamo and National. Viewed as a CEO candidate, she'd be the first non-family member to run the company.

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Last updated October 16 2008: 10:16 AM ET
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