Q&A: David Heyman

David Heyman is on his cell phone, talking about how the "Harry Potter" franchise has changed during the past 10 years, and his voice suddenly drops to barely a whisper. "I've just gone on set and everyone has to be quiet. It costs money if you spoil a take," he laughs quietly. Heyman is shooting the last, two-part installment of a franchise that has become one of the most lucrative in history. When the producer struck a deal to bring J.K. Rowling's creation to the big screen in 1997, no one knew just how big it would get. Heyman recently spoke with The Hollywood Reporter's Stuart Kemp about working with Warner Bros. and just what his future holds in a post-"Potter" world.