I've read alot of books and I don't think anyone beats Master Harper Robinton on Anne McCafferey's Dragon Riders of Pern books. He's got an amazing mind to be able to work to be able manipulate the people of Pern the way he did. I don't think F'lar and Lessa could have gotten as high a ranking as they did without him. Though I'm sure being the riders of the largest gold and bronze dragons help out a little as well. Was anyone really going to aurgue with Ramoth and Mnenemth?
Crimsa Jade
The wizarding shapeshifter

Check out the new Dungeon Masters of Aersralm