This summer, Yahoo (Fortune 500) hired Marissa Mayer as CEO, replacing interim CEO Ross Levinsohn and former chief exec Scott Thompson, who was unceremoniously ousted in May. Thompson's exit was particularly ugly. He had locked horns with powerful activist investor Daniel Loeb in a big way by refusing Loeb's demand for a seat on the company's board. Later, Loeb dug up inaccuracies on Thompson's resume -- namely, a degree in computer science that the executive did not have. Yahoo's troubles competing with search giant Google still loom large, but management and employees at the company are probably glad to see Mayer's fresh face. ,
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