Dave Cullen is the author of the New York Times bestseller Columbine, a haunting portrait of two killers and their victims. He spent ten years on the book, driven by two questions: why did they kill, and what became of the survivors? An expanded edition was released in 2016, with a new epilogue, journal scans and over thirty pages of new material (fifty since hardcover).Cullen has written for New York Times, Vanity Fair, BuzzFeed, New Republic, Guardian, Times of London, Newsweek, Lapham's Quarterly, Washington Post, Slate, Salon, Daily Beast and The Millions. He has written extensively on the military, and is writing a book about gay soldiers told through the lives of two closeted army buddies he has been following for 16 years.