Brian Holinka, a former lead combat designer for World of Warcraft at Blizzard Entertainment, has joined Riot Games as a principal game designer for the League of Legends MMO. His appointment was announced on LinkedIn, marking his first official day at Riot. The League of Legends MMO project has been under development since its announcement in December 2020, and Riot has also hired Raymond Bartos, a former lead producer for World of Warcraft, and Orlando Salvatore, a former lead software engineer from World of Warcraft, to enhance the development team. Greg Street, the former vice president of Riot Games who initially led the MMO project, has taken on a new role in the gaming industry that does not involve an MMO.