Albus Dumbledore

Professor Albus Percival Wulfric Brian Dumbledore, was an English half-blood wizard. He was the Defence Against the Dark Arts Professor, later the Transfiguration Professor, and later the Headmaster of Hogwarts School of Witchcraft and Wizardry. He also served as Supreme Mugwump of the International Confederation of Wizards (?–1995) and Chief Warlock of the Wizengamot (?–1995; 1996–1997). A Muggle-supporting wizard, though the complete opposite in his earlier years, he was considered to have been the greatest wizard of modern times, perhaps of all time.