Treyarch and Infinity Ward are two separate companies. the Modern Warfare series is a storyline on its own, and the Black Ops Series is as well. As for the first CoDs, they are based on actual history.
no they just work together but although treyarch does own infinity ward but activision doent own treyaech
Activision, Treyarch, and Infinity Ward and Sledgehammer
Treyarch and Infinity Ward both make games for Activision who does the series
No it is not being developed by infinity ward but by Treyarch & produced by Activision.
activision~http://www.activision.com/index.html
Infinity Ward developed some of the games and Treyarch developed others both for Activision
No Microsoft did not buy Call of Duty. It is owned by Activision. Treyarch and infinity Ward are co-producers. Treyarch for cod 1,2,3,5,7 and Infinity Ward cod 4,6, and a debate with Activision about cod 8. Microsoft pay Activision for Map packs to come to Xbox 1 month before Sony Ps3s. e.g. The Map packs for cod 6: Resurgence Pack and Stimulus Pack. and Microsoft paid Activision for earlier access than ps3 owners.
Activision published it and owns right to titles, but the inventor (really game Developer company) was Treyarch (owned by Activision). Infinity Ward (also owned by Activision) makes the Modern Warfare series.
No zombies are exclusive to Treyarch designed games for Activision and Modern Warfare is by Infinity Ward
The game was developed by Treyarch and published by Activision and designed by Margaret Tang
activision and treyarch
It is Activision that does it because of an agreement with Xbox 360. Treyarch develops the Games and add ons for Activision