Mayer, who starts at Yahoo Inc. on Tuesday, was one of Google's earliest employees and was most recently responsible for its mapping, local and location services. Mayer, 37, began her career at Google in 1999.
Ross Levinsohn has been running the company on an interim basis and had been thought to be the lead candidate. Levinsohn filled in after Scott Thompson lost his job in a flap over misinformation on his official biography.
Fred Amoroso, Yahoo's chairman, says the board was drawn to Mayer's "unparalleled track record in technology, design, and product execution."
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