Marissa Ann Mayer, a Standford University graduate, is the current President and CEO of Yahoo!. She was previously a long-time executive and key spokesperson for competitor Google, where she also oversaw the layout of the search titan's famous, unadorned homepage. She is the youngest CEO of a Fortune 500 company, and was ranked number 14 on the list of America's most powerful businesswomen of 2012 by Fortune magazine.