HBO announces the stars filling out the Hogwarts staff roster in its upcoming ‘Harry Potter’ TV series. The series will feature John Lithgow as Albus Dumbledore, Janet McTeer as Minerva McGonagall, Paapa Essiedu as Severus Snape, Nick Frost as Rubeus Hagrid, Luke Thallon as Quirinus Quirrell and Paul Whitehouse as Argus Filch.
