The revolving door that is the Zynga CEO's chair has swung again.
Gibeau, who left EA in unexplained circumstances in 2015, has been a Zynga board member since August 2015.
As for Pincus, who replaced ex-EA and Microsoft exec Don Mattrick as CEO Zynga in April 2015, he reverts to his previous role as chairman of the Zynga board.
However, thanks to his shareholding, he effectively remains the power behind the throne.
"Despite the success of mobile games, Mark and I believe that the full promise of Zynga and social gaming has yet to be fully realized," commented Gibeau.
"We believe that Zynga has an opportunity to create new social experiences to connect even more players together. We will continue to invest in our talent and build on our empowered, entrepreneurial culture.
"As important, we must commit to a new level of operational excellence with focused execution, engineered hits and strong cost discipline.
"I'm encouraged by our early momentum and look forward to partnering with our teams to build on the progress we're seeing across the company."
Pincus added: "Frank has also been a big supporter of our move to smaller more nimble teams. Equally important, we have worked well together and share a common vision for Zynga around mobile and social gaming."