The two-time Oscar nominee, who has played the likes of Winston Churchill and Roald Dahl before, could become the first confirmed named for the new show.

John Lithgow is in final talks to play Professor Dumbledore in HBO’s TV adaptation of Harry Potter. The 3rd Rock From the Sun star would play the bearded headmaster of Hogwarts wizarding school whose Order of the Phoenix fights evil Lord Voldemort.

Hollywood has a not-so-mysterious way of casting who they want for roles in films and television shows with major IPs. There is usually a breadcrumb trail that you can trace back to a few previous projects that will help you understand why a choice was made for a particular actor.