Watch: Will Cillian Murphy Play Voldemort in 'Harry Potter' Series? He Says...Accio, John Lithgow as Albus Dumbledore! The six-time Emmy winner looked nearly unrecognizable dressed as the Hogwarts headmaster while filming HBO's upcoming Hary Potter series in England Oct. 7. Similar to the late Richard Harris and Michael Gambon from the Harry Potter film franchise, Lithgow rocked a long, gray beard and half-moon glasses for his take on the beloved character. He capped off the wizard's look with lengthy dark robes.