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Valve veteran Christopher Green retires again, says a popular mode was made in secret

Christopher Green announced his permanent retirement after a second stint at Valve and held Reddit AMAs reflecting on 45 years in game development. He said that at least one of Valve's beloved game modes was developed in secret to avoid pushback from peers. Green spent a combined 16 years at Valve and worked on projects including both Source engines, Portal, The Orange Box and Day of Defeat: Source.

• Green is retiring from Valve permanently after returning in 2023
• He said at least one popular Valve game mode was developed secretly to avoid internal pushback
• 16 years at Valve; credited on Source engines, Portal, The Orange Box, Day of Defeat: Source
• Earlier work includes Amiga flight sims, Ultima Underworld and Magic: The Gathering Online