Infinity Ward, located in Encino, California, is an American video game developer founded in 2002 by 22 former employees of 2015, Inc., including the project leads who had worked on Medal of Honor: Allied Assault. The company was acquired by Activision in October 2003, and currently consists of nearly 100 employees. Infinity Ward is responsible for the development of the video game Call of Duty and three other installments in the Call of Duty franchise.
Infinity Ward's first title, Call of Duty, won over 70 Game of the Year awards and 50 Editor's Choice Awards.The sequel, Call of Duty 2, was the first title to sell over one million units on the Xbox 360 in the United States.It also continues to be among the highest-rated games for the platform, according to Game Rankings. Call of Duty 4: Modern Warfare has also enjoyed massive commercial and critical success, selling over 13 million copies from its release in November 2007 through May 2009.
Infinity Ward's Call of Duty 4: Modern Warfare runs on a proprietary game engine with features that include true world-dynamic lighting, HDR lighting effects, dynamic shadows and depth of field. The engine was not used in any of the company's previous games.[6] Both Call of Duty: World at War and the James Bond video game Quantum of Solace were developed by Treyarch using modified versions of Infinity Ward's engine.
Modern Warfare 2, Infinity Ward's latest project, will utilize a new proprietary engine dubbed "IW 4.0", which has been claimed to be a generation more advanced than the engine used in Call of Duty 4.
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http://en.wikipedia.org/wiki/Infinity_Ward