Doerr, 61, becomes the second Zynga director from the ranks of Kleiner Perkins, which began backing the company in 2008 and guided it to its 2011 initial public offering.
William "Bing" Gordon, another Kleiner Perkins investor, also holds a seat on Zynga's board.
One of Kleiner Perkins' high-profile bets in recent years, Zynga has been a disappointment since its IPO. Gamers and investors alike have fled the company, and its shares currently trade at roughly one-third of their $10 IPO price.
Zynga CEO Officer Mark Pincus has vowed to lead a turnaround in 2013 by introducing games that can be played across the Web and on mobile devices. On Thursday, he slashed his own salary to $1.
Pincus called Doerr a trusted advisor who could help Zynga navigate a "pivotal" year of transition.