Fannie Mae’s CEO Timothy Mayopoulos is leaving his post by the end of this year after being with the GSE since 2009. Fannie announced his departure last week along with a new leadership structure. Mayopoulos became CEO in 2012 after being promoted from chief administrative officer and general counsel. He will remain on board until the end of 2018 and work with the board of directors to make sure the transition is seamless. During his tenure, Fannie has been profitable each year. “For Fannie Mae, it has been a decade of reform and fundamental change.