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25. Jan Fields
President, McDonald's USA
McDonald's (MCD)
2009 rank: 32
Age: 55

Some three decades after starting as a crew member in Dayton, Fields took charge of the company's 14,000 U.S. restaurants in January. She boosted same-store sales and operating income in her first two quarters on the job, with the help of frappes and smoothies.

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Last updated September 30 2010: 2:47 PM ET
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