This book is the first comprehensive study on the work and functioning of the Extraordinary Chambers in the Courts of Cambodia (ECCC). The ECCC were established in 2006 to bring to trial senior leaders and those most responsible for serious crimes committed under the notorious Khmer Rouge regime. Established by domestic law following an agreement in 2003 between the Kingdom of Cambodia and the UN, the ECCC’s hybrid features provide a unique approach of accountability for mass atrocities. The book entails an analysis of the work and jurisprudence of the ECCC, providing a detailed assessment of their legacies and contribution to international criminal law. The collection, containing 20 chapters from leading scholars and practitioners with inside knowledge of the ECCC, discuss the most pressing topics and its implications for international criminal law. These include the establishment of the ECCC, subject matter crimes, joint criminal enterprise and procedural aspects, including questions regarding the trying of frail accused persons and the admission of torture statements into evidence. Simon M. Meisenberg is an Attorney-at-Law in Germany, formerly he was a Legal Advisor to the ECCC and a Senior Legal Officer at the Special Court for Sierra Leone. Ignaz Stegmiller is Coordinator for the International Programs of the Faculty of Law at the Franz von Liszt Institute for International and Comparative Law, Giessen, Germany.