Dr. Dave should be somewhere in the top half of that list. Few people have had such a widespread impact on the game of pool. He accumulated (and/or developed) comprehensive and accurate knowledge of all things pool (just about literally, not figuratively) and is single handedly responsible for the greatest increases of general knowledge and skill and shortened learning curves among players in the history of the sport. There are few in pool that haven't learned at least something as a result of him (whether directly or from somebody else that got it from Dr. Dave), few that haven't passed on information they learned from him to someone else and/or referred somebody to his site, and almost nobody that hasn't heard of him. You would be hard pressed to find a bigger or wider influence in pool that has had more impact.
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