CEO, eBay (EBAY)
Age: 50
Whitman made noises about leaving eBay after 10 years, but today she's more firmly in charge than ever. She's shaken up the executive ranks and eBay is growing fast again after hitting a rough patch. Earnings shot up an impressive 52% in the first quarter thanks mostly to acquisitions that Whitman spearheaded, including Skype, Shopping.com and PayPal. Next up is a makeover of the original eBay marketplace to get auctions moving again. Age: 50
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