Most Powerful Women: A year of highs and lows

It was a year of major milestones -- and disappointments -- for female business power players. A look at some of the biggest leadership moves in 2012.

Marissa Mayer
marissa mayer
Company: Yahoo
Title: President and CEO

In July, Marissa Mayer ended her 13-year stint at Google (GOOG, Fortune 500) to take the reins at Yahoo (YHOO, Fortune 500), all while pregnant with her first child. The new mom and CEO multi-tasked her way through the challenges; she claims working at the struggling tech company is "fun" and that her son Macallister is "easy." Mayer admits a turnaround at Yahoo will take several years, but hopes to address the company's identity crisis by making its suite of desktop assets -- email, news, weather, stock quotes -- easily accessible on mobile devices; she also says she's focusing on employee performance rather than potential.


  @FortuneMagazine - Last updated December 26 2012 12:09 PM ET
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