Dave Cullen spent ten years writing and researching Columbine, a haunting portrait of two killers and their victims. Columbine was a New York Times bestseller, named to two dozen Best of 2009 lists, and won several awards including the Edgar. Dave has written for New York Times, Washington Post, Times of London, Slate, Salon, Daily Beast and Guardian. He created a Columbine Instructors Guide, which is available free online. He recently moved from Denver to Manhattan.