From WoWWiki

Gryan Stoutmantle is an elite level 35 quest giver located in Sentinel Hill in the human territory of Westfall. He is affiliated with the People's Militia. Raids on Sentinel Hill with the goal to kill him are common, mostly to provoke a response from nearby Stormwind and draw Alliance players away in preparations for attacks on the city.

He starts the following quests:

•  [12] The People's Militia
•  [14] The People's Militia (2)
•  [17] The People's Militia (3)
•  [14] Messenger to Westfall (2)
•  [18] The Defias Brotherhood
•  [18] The Defias Brotherhood (3)
•  [18] The Defias Brotherhood (5)
•  [22] The Defias Brotherhood (7) (Dungeon)

See List of Westfall NPCs.