The "Gold-Toothed Doctor", also known as "The Alchemist Doctor", is a minor antagonist in the original Fullmetal Alchemist story-line. An unnamed old man who was in possession of his very own Philosopher's Stone, he is also one of the few responsible for Wrath's creation. He is privy to Amestris' top secrets and carries out Father's orders in a ruthless fashion. (Source: Fullmetal Alchemist Wiki)