Marissa Mayer is the current CEO of Yahoo! and the youngest CEO of a Fortune 500 company. After graduating from Stanford University with a B.S. in symbolic systems and an M.S. in computer science, she worked USB Research Lab and SRI International. In 1999 she joined Google. She was Google's first female engineer. There, she was involved in nearly all of the services that Google offers, including maps, books, images, toolbar, and mail. In July 2012, Ms. Mayer was appointed President and CEO of Yahoo! She sits on numerous boards including that of Walmart, New York City Ballet, and San Francisco Museum of Art. She has been named to Fortune's 50 most powerful women in business since 2008.