Conversation so far:
Did Marissa Mayer ever work for Google?
She joined Google in 1999 as employee number 20.
What was Marissa Mayer's position at Google?
She started out writing code and overseeing small teams of engineers, developing and designing Google's search offerings.
Did Marissa Mayer ever receive a promotion to a higher position?
She became known for her attention to detail, which helped land her a promotion to product manager, and later she became director of consumer web products.
Are there any other interesting aspects about the Marissa Mayer article?
In 2002, Mayer started the Associate Product Manager (APM) program, a Google mentorship initiative to recruit new talents and cultivate them for leadership roles.
Did Marissa Mayer hold any other positions at Google, besides engineering,  and Product Management?
In 2005, Mayer became Vice President of Search Products and User Experience until the end of 2010, when she became head of the Local, Maps, and Location Services.
Does Marissa Mayer still work at Google?
On July 16, 2012, Mayer was appointed president and CEO of Yahoo!, effective the following day.

Question: Why did she leave Google?
Self-contained rewrite: Why did Marissa Mayer leave Google?