Zynga has announced changes in the company’s executive team as COO Clive Downie has resigned from the social gaming company while former Genentech CFO Louis Lavigne joined the board.

The move comes 15 days after the company announced that Don Mattrick, the chief executive of Zynga for 20 months, left and was replaced by founder and CEO Mark Pincus.

Downie had joined Zynga in November 2013 as chief executive of its American and European businesses and holding responsibility for its mobile gaming platform.

Downie has now joined Unity Technologies, the developer of a widely-used 3D gaming engine, as chief marketing officer.