Farwhisper the Elder

"The heavens, in their countless stars, hold answers to earthly mysteries, . Might, then, the wise, and the lucky, gaze up and find truth?"

He can be found in Festival Lane of Stratholme

For higher levels with stealth, you can sneak in and get him. Quickest route to take is via Elders' Square service entrance. Go in open instance portal, open gate, take first left, through the big Archway sneak around the mobs to your right. By then you should have the "!" icon on your mini-map. Found this way much quicker than the front entrance way.