I'm not sure whether I'm referring to Alexey Pazhitnov or Robert Stein, to be honest. One man's idea became an international phenomenon, and launched a whole new genre of game design. The other ruined countless lives in his drive to control it. Either way, a difference was made.
If any of you happen to be looking for TV movies to produce, follow that link. It's got all the makings.
(Thanks, indirectly, to diethylamide for the link)