Which company was this American game designer who designed the set of Planescape Campaign Setting employed for more than a decade?
David Cook (game designer) David "Zeb" Cook is an American game designer, best known for his work at TSR, Inc., where he was employed for over fifteen years.
Stephen R. Marsh Stephen R. Marsh is an American game designer and lawyer best known for his contributions to early editions of TSR's "Dungeons & Dragons" fantasy tabletop role-playing game (RPG). Some of the creatures he created for the original edition of "D&D" in 1975 have been included in every subsequent edition of the game.