Gray Matter Interactive Studios, Inc. was a computer game developer, which was acquired by Activision in January 2002. Gray Matter was previously known as Xatrix Entertainment, Inc. Their first big project was the creation of Call of Duty: United Offensive.
Towards the end of development for Call of Duty 2: Big Red One in 2005, Gray Matter was merged into Treyarch, and the team is no longer recognized by that name. Some of the Gray Matter team still resides at Treyarch, although its founder and several executives from the former studio have found employment elsewhere.
Related to the Call of Duty series 
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Gray Matter Interactive developed Call of Duty: United Offensive, an expansion for Call of Duty. They also helped develop Call of Duty 2: Big Red One in conjunction with Treyarch.
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