David John Bradley (born 17 April 1942) is an English actor. He is known for playing Argus Filch in the "Harry Potter" film series, Walder Frey in the HBO fantasy series "Game of Thrones", and Abraham Setrakian in the FX horror series "The Strain". He is also an established stage actor, with a career that includes a Laurence Olivier Award for his role in a production of "King Lear". Other acting credits include the BBC Two series "Our Friends in the North", the ITV series "Broadchurch" (for which he won the Best Supporting Actor award at the 2014 British Academy Television Awards), the BBC One miniseries "Les Misérables", the comedy series "After Life" and the films "Hot Fuzz", "The World's End" and "".