Born in London, England, Gary Oldman is known for films like Sid and Nancy, The Dark Knight, and the Harry Potter series. Oldman has been acting since he was a child and made his United States breakthrough in 1991. In fact, he has lived in the United States for such a long time that he had to hire voice coach in order to keep and relearn his British accent. Oldman needed his full-fledged British accent—as opposed to the American one he had acquired—for his role as an intelligence officer in Tinker Tailor Spy Soldier in 2011. As such, he invested in a dialect tutor to make sure his accent remained as authentic as the day he left England.