...or the Dungeon Master. Referee. Judge. Narrator. Storyteller. Showrunner. Whatever you want to call it. It's the most satisfying hobby I know. I am the God of my own microcosm. I have the power to create alternate realities. The worlds inside my head are as real to me as the outside world. Here is a grandiose and borderline silly picture (sort of a poor man's William Blake illustration) of the Game Master (here the DM) at work.
This picture, incidentally, comes from an article by Gary Gygax on alignment in The Dragon #9, in which he advises some players to hide their alignment, even from the DM. Interesting.