Mediaweek is reporting that Jonathan Epstein has left his post as CEO of in-game ad agency DoubleFusion. Alex Sood, who formerly headed the firm’s Asia division, is taking his place. DoubleFusion also announced that it has secured funding from Jerusalem Venture Partners. The amount has not been disclosed. Mediaweek says the news comes in the face of a brutal 2009 for in-game ad firms. Read more at Mediaweek.