The GM wears a lot of hats, and depending on the table you sit at the primary role of a GM can change from game to game. The question for today is what is the GM's primary role in your game?
Storyteller, Rules arbiter, combat officiator, antagonist provider, world builder, game maker. Those are the ones I see the most. What about you?
To me, and the games I play, the GM is primarily a Story Teller. The title doesn't give the full details, because the GM works with the players to tell the story, but the GM has a large burden of it. The GM pokes and prods the PCs, has the world react to the PCs, and at times has the world sucker punch the PCs to get things moving.
After that comes Antagonist Provider and Rules Arbiter in equal measure, with a dash of combat officiator thrown in.
How about at your table?