If Pathfinder had a brand-specific term for "Gamemaster", what would it be?

A lot of RPGs use a specific term for their game to refer to the gamemaster of that game. D&D obviously has the Dungeon Master; the Storytelling system (used by Vampire: The Masquerade) has the Storyteller; Call of Cthulhu has the Keeper.

If Pathfinder was going to have its own unique term rather than using the generic Gamemaster, what should it be?