Glen Schofield, co-creator of several Call of Duty games, announced today on Twitter that he was leaving Sledgehammer Games, the game studio he cofounded in 2009 with Michael Condrey.

Schofield and Condrey worked together at Electronic Arts’s Visceral Games studio before starting Sledgehammer, with work that culminated in the hit title Dead Space.

They started Sledgehammer Games in San Mateo, California, not far from their old Visceral location, and they began hiring a team that would become hundreds of people. They were enlisted to help with Activision’s Call of Duty: Black Ops title in 2010 and Call of Duty: Modern Warfare in 2011.

But their first solo effort under Activision was Call of Duty: Advanced Warfare, which debuted in 2014. Most recently, Schofield and Condrey headed the team that produced Call of Duty: WWII in 2017.

In early 2018, Kotaku reported that both Schofield and Condrey left Sledgehammer, and that Aaron Halon, one of their leaders, was appointed to lead Sledgehammer. Schofield and Condrey were reportedly assigned new roles as executives inside Activision. But the details were kept secret.

Schofield and Condrey spoke about the development of Call of Duty: WWII at our GamesBeat Summit event in 2017.