User blog comment:Armyman234/Treyarch hands over DLC production to Raven Software/@comment-1017446-20101202005503/@comment-2040725-20101202013316

Raven did SoF 1 and 2. They also did Jedi Knight 2 and Jedi Academy. These games were top FPS when they came out, and Raven's been doing this before Treyarch even existed.