Michael Change Gummelt is the former lead designer at Raven Software. He worked on development for Call of Duty: Black Ops, Call of Duty: Modern Warfare 3, Call of Duty: Ghosts, Call of Duty: Advanced Warfare, Call of Duty Online, Call of Duty: Black Ops 4, Call of Duty: Modern Warfare, Call of Duty: Warzone and Call of Duty: Black Ops Cold War. He also pitched the cancelled game, Project Zed, that began development in 2011.