 After "Warcraft III" shipped, he joined with the "WoW" team as one of the first two quest designers along with Pat Nagle, and worked closely with the game's creative director Chris Metzen.Kaplan's work focused on the player versus environment elements of "WoW", including quest design and the overall aesthetics for the various dungeons and raids; he described his position as a "medium" between Metzen's creative elements and the programmers and artists of the level design team.Eventually, Kaplan was named as game director for "WoW", along with Tom Chilton and J. Allen Brack.