Dave Arneson was the other creator of D&D and in retrospect, I think he was the one who really drove the RPG and world creating aspect of it. Gygax was more int

Dave Arneson was the other creator of D&D and in retrospect, I think he was the one who really drove the RPG and world creating aspect of it. Gygax was more interested in designing the rules, but Arneson created the first campaign (Blackmoor). There's a book called "Playing at the World" that goes into the details of all this, but my takeaway was that Gygax was more of a rules guy, and Arneson was the story teller. Also a great read if you want to know a lot about the corporate side of the whole situation...