Yahoo lost its top media executive, Scott Moore, but quickly replaced him with a longtime Microsoft executive Jeff Dossett, who was most recently general manager of Microsoft's MSN Media Network.
Mr. Moore, who has spent more than three years at Yahoo and led some of its most successful content initiatives, did not immediately respond to a request for comment, and Yahoo would only say that he's leaving to "pursue other opportunities."
Mr. Moore joined Yahoo in 2005 after serving as general manager of MSNBC.com, and ultimately oversaw Yahoo Sports, Yahoo Finance and Yahoo Sports, which was the most-trafficked website for Olympics coverage during the Beijing Games in August.
Also leaving Yahoo is Al Warms, general manager of Yahoo News and one of Mr. Moore's direct reports. Mr. Warms will be replaced by VP-Programming and Development Neeraj Khemlani, who will continue to oversee original content.
Mr. Dossett, who will report to Yahoo President Hilary Schneider, joined MSN in 2000 but worked at Microsoft since 1991, except for a two-year hiatus in which he climbed the highest peak on each of seven continents, known as the "seven summits." Prior to running media operations at MSN, Mr. Dossett had served as CEO of MSN Autos and general manager of MSN Real Estate & MSN Lifestyle.
Separately, Yahoo beefed up its sales and marketing ranks by hiring former Heavy.com Chief Marketing Officer Eric Hadley as VP-U.S. field marketing, a newly created position, reporting to Senior VP-Marketing Nick Besbeas.
Before Heavy, Mr. Hadley was general manager of Microsoft's MSN Marketing division, where he worked closely with Joanne Bradford, who was chief media officer at MSN before moving to online ad firm Spot Runner and then to Yahoo as senior VP of U.S. revenue.