Producers

The best producers are the ones who have such taste in movies, that they literally decide to live in them. They marry actors, actresses, or they obsesses about them (see Pauline Kael). They are the impetus for the creators. And they don't enter in the creating process, and they damn well not say too much once it's done, but the thing they should say, should be... well, something like leveling a crooked picture.