His work has appeared in numerous international publications, including The New York Times, Newsweek and The Guardian. He also worked for Greenpeace International and UNICEF. In 1999, he received an award from the John Hopkins University for Excellence in International Journalism for exposing the head of the Khmer Rouge secret police and commandant of the infamous S-21 prison, comrade Duch, what was described in his famous book, The Lost Executioner. Nic also co-wrote and co-directed Burma Soldier, an HBO film which was awarded the Grand Jury Prize at the United Nations Association Film Festival in 2011 and nominated for an Emmy for Outstanding Individual Achievement in Writing the following year.