Treyarch Corporation (/ˈtreɪɑːrk/ TRAY-ark;[2] formerly Treyarch Invention LLC) is an American video game developer based in Santa Monica, California. Founded in 1996 by Peter Akemann and Doğan Köslü, it was acquired by Activision in 2001. The studio is known for its work for the Call of Duty series, which it develops alongside Infinity Ward, Sledgehammer Games and Raven Software.