Three executives are departing Zynga as part of an executive reshuffling by the online game maker’s new CEO, Don Mattrick. Earlier this summer, Zynga Inc. hired Mattrick from Microsoft, where he led the Xbox business. Mark Pincus, Zynga’s founder, remains chairman and chief product officer after handing CEO duties over to Mattrick. The three executives leaving the company are Chief Technology Officer Cadir Lee, Chief Operations Officer David Ko and Chief People Officer Colleen McCreary. Mattrick announced the departures in a memo to employees posted on Zynga’s blog. Mattrick says San Francisco-based Zynga is “taking layers out” of its executive ranks. Steve Chiang will now serve as executive vice president of games. Nick Tornow will be chief technology officer and vice president.