Marissa Mayer will be Yahoo Inc.'s fifth CEO in five years, not including two interim CEOs. She's also the fourth interim or permanent CEO this year. Here's a look at the people who have had that top job over the years.
Tim Koogle - 1995-May 2001. Began tenure shortly after Yahoo was incorporated in March 1995. Announced in March 2001 that he would step down after a replacement is found.
Jerry Yang - June 2007-January 2009. Company co-founder and de facto CEO until Koogle started. Agrees to resign under pressure in November 2008, pending appointment of replacement.
Carol Bartz - January 2009-September 2011. Hired from Autodesk Inc., a design and engineering software company. Fired after failing to revive the company.
Scott Thompson - January 2012-May 2012. Hired from eBay Inc.'s PayPal. Left after disclosure that his official biography included a college degree he never received.
