On Thursday, Yahoo! (YHOO) shareholders will vote on whether or not to approve Verizon's (VZ) - Get Report acquisition of the company's core internet business. If the deal is approved as expected, it will mark the end of Marissa Mayer's five-year tenure as CEO of Yahoo!. Here are 11 key moments from her eventful run at the top of the company.

1. Yahoo! Names Mayer C.E.O.

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In the summer of 2012, Marissa Mayer left Alphabet's Google (GOOGL) - Get Report to take the helm of Yahoo! after activist shareholder Daniel Loeb pushed out Yahoo!'s former CEO and backed her for the job. Mayer left quite the legacy at Google. Having come aboard during the company's infancy in 1999, she was responsible for its Maps & Locations Services, including Google Maps, Google Earth and Zagat. She was also credited for developing the "look and feel" of Google's user experience, managing such products as Gmail and the Google search bar.

Mayer's reputation as an innovator gave shareholders hope for the struggling Yahoo! The company had experienced four turnovers in leadership in less than a year, and earlier in 2012, a series of layoffs resulted in a 14% depletion of staff. Mayer, shareholders believed, would restore stability as well as a focus on consumers to the company. Yahoo! released a statement on the day of her appointment, stating that the move signaled a "renewed focus on product innovation to drive user experience and advertising revenue."