From PCGamer: “The past two decades have been good to Raphael Colantonio. He founded Arkane in 1999, led it through Arx Fatalis and Dark Messiah of Might and Magic, and then hit the big time in 2012 with Dishonored and its multiple expansions and sequels. But after the release of Prey in 2017, he packed it all in, saying he wanted to step back from the industry and “reflect on what is important” to him and his future.”
Source: N4G PC Former Arkane boss on why he left: 'You're not making a game anymore, you're making a product'