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According to an Aug. 8 SEC filing, his resignation "was not tendered in connection with any disagreement with the Company on any matter relating to the Company’s operations, policies or practices."
His resignation is not a terrible surprise. Late last month, reports emerged that Schappert was no longer overseeing game development. Two executives who then reported to him -- David Ko, chief mobile officer, and Steven Chiang, EVP of Zynga's games division -- began reporting directly to CEO Mark Pincus rather than Schappert.
Schappert was a high-profile hire for Zynga, who joined the firm in April 2011 after leaving an executive position at Electronic Arts.