Headmaster, Hogwarts School of Witchcraft and Wizardry.  Order of Merlin, First Class.  Grand Sorcerer.   Chief Warlock, Supreme Mugwump, International Confederation of Wizards.  Warlock of the Wizengamot. Founder of the Order of the Phoenix.  Considered by all except the Death Eaters to be the most powerfull of all wizards.