Gary Leonard Oldman is an English actor, filmmaker, and musician. Oldman rose to prominence in the United Kingdom with his portrayals of Sid Vicious in Sid and Nancy and Joe Orton in Prick Up Your Ears , as well as that of a football firm leader in The Firm , before going on to achieve international renown as Lee Harvey Oswald in JFK and Count Dracula in Bram Stoker's Dracula . Oldman starred as antagonist Norman Stansfield in Léon: The Professional , as well as the villains of motion pictures such as True Romance , The Fifth Element , Air Force One , and The Contender ; he meanwhile gave an acclaimed reading of Ludwig van Beethoven in Immortal Beloved . In the 21st century, Oldman is known for his portrayals of Sirius Black in the Harry Potter series, James Gordon in Christopher Nolan's The Dark Knight trilogy, and George Smiley in Tinker Tailor Soldier Spy .