Mayer sent a note to the company on Monday announcing his departure, a Yahoo spokesperson confirmed in an e-mail to Mashable. "Ross has done a terrific job during his time at Yahoo!. We wish him all the best," the spokesperson wrote.
The news was originally reported by AllThingsD.
Before becoming interim CEO -- a post he was named to after Yahoo's last CEO, Scott Thompson, was pushed out by the company's board -- he served as Yahoo's executive vice president of the Americas. Many thought he would be instated as the company's long-term CEO before Mayer was named to the post, especially since he did so well in the interim period, negotiating the sale of the company's stake in Alibaba and handling a difficult patent dispute with Facebook.
Levinsohn served as interim CEO from May 13 to July 17. He joined Yahoo in late 2010 under then-CEO Carol Bartz. Before Yahoo, he worked at Fuse Capital, a digital media fund. Before that, he worked at News Corp.