Jacob Franklin "Frank" Mentzer III (born in 1950), is an American fantasy author and game designer best known for his work on early materials for the Dungeons & Dragons (D&D) fantasy role-playing game.
Jacob Franklin "Frank" Mentzer III (born in 1950), is an American fantasy author and game designer best known for his work on early materials for the Dungeons & Dragons (D&D) fantasy role-playing game.