Damien Monnier was a senior gameplay designer of The Witcher 3: Wild Hunt card game Gwent. He later became the lead designer on Gwent: The Witcher Card Game. In 2016, he left CD PROJEKT RED and went and joined the company Techland.
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There is a reference to him in Blood and Wine expansion, with a character named Martin Monnier, the creator of the Skellige Gwent deck.