Professor Albus Percival Wulfric Brian Dumbledore is a fictional character in the Harry Potter series of novels by J. K. Rowling. For most of the series, he is the headmaster of the wizarding school Hogwarts. He is also the founder and leader of the Order of the Phoenix, an organisation dedicated to fighting the Dark wizard Lord Voldemort. Dumbledore is portrayed by Richard Harris in the film adaptations of Harry Potter and the Philosopher's Stone (2001) and Harry Potter and the Chamber of Secrets (2002). Following Harris' death in October 2002, Michael Gambon was cast in the role.
https://en.wikipedia.org/wiki/Albus_Dumbledore