Ryan Feltrin is a games programmer. Feltrin has been working with id Software, Raven Software, Treyarch and Nerve Software. Feltrin's first game was QUAKE II Mission Pack: The Reckoning published by Activison for PC in 1998. After that, Ryan Feltrin took part as the programmer of Kingpin — Life of Crime. Feltrin also worked on Call of Duty: United Offensive developed by Gray Matter Interactive for PC and macOS. Most recently, Ryan Feltrin was involved in the development of Call of Duty: Black Ops Cold War.