Contributor(s): Brad Adams, Margo Picken, Simon Taylor | Senior leaders of Pol Pot's Khmer Rouge regime of Democratic Kampuchea are now on trial in Cambodia for the crimes committed between 1975 and 1979 when two million people are estimated to have died. Will these trials help to break the impunity that has characterised Cambodia's recent history and which continues today? Brad Adams is executive director of Human Rights Watch's Asia Division and is a general expert on Asia. Simon Taylor is one of three co-founder/directors of Global Witness, a London and Washington DC based NGO which investigates and campaigns to prevent natural resource-related conflict and corruption and associated environmental and human rights abuses. Margo Picken has worked in the field of human rights for much of her professional career. Most recently, she worked for the United Nations as director of the Office of the High Commissioner for Human Rights in Cambodia from 2001 to 2007.