John Lithgow is joining HBO’s Harry Potter series to play Professor Album Dumbledore. On Wednesday, sources familiar with the deal told Deadline that Lithgow is in “final negotiations” for the role, though HBO declined to confirm the news.

That’s Headmaster Lithgow to the rest of us. Emmy winner John Lithgow (3rd Rock From the Sun) is close to a deal that will have him fill the role of Hogwarts headmaster Albus Dumbledore in HBO’s forthcoming Harry Potter series,

The premium cabler is in talks with John Lithgow to play Albus Dumbledore, the headmaster of the Hogwarts School of Witchcraft and Wizardry. News of Lithgow’s potential involvement follows THR’s reporting that British actor Paapa Essiedu ( I May Destroy You) is in discussions to play Professor Severus Snape. HBO declined comment.