#12 Marissa Mayer
Company: Yahoo
Marissa Ann Mayer has been President and CEO of Yahoo! since July 2012. Previously, she was a long-time executive and key spokesperson for Google. Marissa Mayer's arrival at Yahoo as chief executive a year and a half ago was widely hailed as an opportunity to infuse the struggling Internet pioneer with the smarts and cachet that had helped her succeed as a top executive at Google.
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