Zynga founder Mark Pincus is rejoining the gaming company as CEO effective immediately, replacing Don Mattrick, who led Zynga for less than two years.

The executive shuffle comes after the company struggled in recent years to maintain its early growth rate. It hired Mattrick in 2013 to help restore Zynga’s business and expand its user base.

Zynga, founded in 2007, found success in its early years with games like “FarmVille” and “Zynga Poker.” It won early success publishing its games through Facebook but has since shifted focus to mobile versions. The company makes its money primarily through advertising and through users’ purchases of virtual goods.

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