Pi Studios is a computer game software developer founded in 2002 by Robert Erwin, John Faulkenbury, Rob Heironimus, Dan Kramer and Peter Mack whose first commercial work can be found in Activision's Call of Duty: United Offensive. The company originated in Plano, Texas and relocated to Houston, Texas in January, 2005.
In November, 2005, Pi Studios released Call of Duty 2: Big Red One for the PlayStation 2, the Xbox, and the GameCube. Work on that project was done jointly with Activision's internal studio, Treyarch. This led to work on Call of Duty 3 in October 2006, developed jointly with Treyarch. Pi's work on the Call of Duty franchise continued with the Call of Duty 3 Bravo Map Pack (downloadable via Xbox Live Arcade) followed by Call of Duty: World at War, in which they assisted Treyarch in creating the single player mission "Blowtorch and Corkscrew".