Zynga opened up June by closing multiple studios and cutting hundreds of jobs. As the month comes to a close, the company is now losing the executive that oversaw the publisher’s expansion into third-party publishing.

Zynga vice president of partner publishing Rob Dyer revealed this morning that he is leaving the company to pursue new opportunities in the mobile- and social-gaming sector.

The social developer hired Dyer in November 2011 to oversee its efforts to publish smaller studios’ games. That led to Zynga publishing games like Village Life on Facebook and Eden to Green on mobile.

This isn’t the first departure from Zynga’s publishing side. In March, Zynga director of publishing Nathan Bosia quietly left the company, according to his LinkedIn and verified independently. Bosia served directly under Dyer, and the two composed the company’s partner-publishing team.

We’ve reached out to Zynga to determine the current state of its third-party efforts.

The company is putting a lot of chips on third-party developers buoying its player numbers. It plans to release a lot more games than it can produce alone.

Before Zynga, Dyer worked as senior vice president of publisher relations at Sony Computer Entertainment America. In that role, he oversaw the PlayStation brand’s relationship with North American game publishers.

This is another major exit for a big name at Zynga. The company suffered a string of these throughout 2012 and early 2013.

Other departures include chief game designer Brian Reynolds, chief creative officer Mike Verdu, chief security officer Nils Puhlmann, chief technical officer of infrastructure Allan Leinwand, OMGPOP chief revenue officer Wilson Griegel, Words With Friends co-creators David and Paul Bettner, and OMGPOP chief executive Dan Porter.