Jimmy Zielinski was an animator and former Creative/Design Director for the Nazi Zombies mode at Treyarch.
He was a member of the original team behind Nazi Zombies in Call of Duty: World at War. He was then responsible for the Zombies experience in Call of Duty: Black Ops and Call of Duty: Black Ops II (excluding the maps Mob of the Dead and Origins).
In December 2014, Jimmy Zielinski left Treyarch Studios.[1]