September the 10th, 2001. I had just returned from spending two months in China. I went to sleep that night. I woke up the next morning exhausted, tired, jet-lagged. I went out of my office, which is very close to the World Trade Center. Somebody called me and said, ‘the World Trade Center's on fire’. I looked out my window and to my astonishment, I grabbed my cameras and ran up on the roof of my building and started photographing, because that is what I do. I photograph. I am a documented photographer and I document the world that I live in. Then to my horror, one of the towers collapsed and I photographed it. Then, the second tower collapsed and I just couldn’t believe my eyes. I was in kind of a sense of denial, I couldn’t believe it, and I spent the rest of the day down at Ground Zero photographing this terrible day.