Someone, that is a player first in bordeglobal.com, or other community groups is what you require.
But, you will of course be looking for a committed player, thats actively involved.
I'm supprised there is only two active dungeon masters, Daishain and KN, here, I presume?
A quick cursory look over at the science fiction Role-playing Game's, indicates that there hasn't been much activity there either.
I personally wouldn't mind seeing an active science fiction Role-playing Game also. But, I can see why you would need more GM's, in addition to dungeon master's.