In Morrowind you could find grandmaster trainers who could train your skills. My question is who is the most powerful smith in Skyrim? I'm trying to build a master craftsman but I need the training to get to that goal.
If you're looking for a fast way to get to 100 smithing, I suggest just buying a bunch of leather strips and iron ingots from all the blacksmiths around the cities and then create a bunch of iron daggers. Doing this it took me around 1 hour and 4000 gold to get to smithing level 100, starting from around level 40.
If you have the Dawnguard DLC installed, Gunmar is a master Smithing trainer. He can be found in Fort Dawnguard if you side with the Dawnguard and advance the quest line far enough that you have gathered some additional recruits.
Edit: A bonus is that like Eorland, he is a merchant so you can purchase training and then sell him stuff to get your gold back.