Shigeru Miyamoto

Super Mario Galaxy will be released soon. As always, Miyamoto is behind it. The man is almost single-handedly responsible for Nintendo's success. Zelda, Donkey Kong, Wave Race, Pikmin and Mario (just think of all that has come of Mario: Mario Kart, Mario Party, Super Smash Bros., Warioware, many great and iconic characters) are among his creations.
His games are exciting fantasies, textbook examples of how to make something that appeals to children and the inner child in all of us (we never stop dreaming). Many of the events and characters of his games are inspired by events of his childhood. Zelda is inspired by his explorations into the wilderness around his home. These are things that we can all relate to.
It'd be easy to dismiss his work (being video games), but video games have become as much art as film and literature. And in this field, Miyamoto reigns supreme.
Funnily enough, the man himself doesn't much play video games, preferring to play guitar.