"Sefton Hill is an English video game developer, director and writer and, with Jamie Walker, the co-founder of Rocksteady Studios. He served as game director for all three Batman: Arkham games developed by the studio, and served as co-writer for 2011's Batman: Arkham City and 2015's Batman: Arkham Knight, the final game in the series."@en . "Sefton Hill"@en . .