In Crimes Against Humanity in the 21st Century, Dr Robert Dubler SC and Matthew Kalyk provide a comprehensive analysis of crimes against humanity in international criminal law. The text tracks the crime from its conceptual origins in antiquity, to its emergence in customary international law at Nuremberg, to the establishment of the ‘modern definition’ at the Hague with the ICTY, ICTR and ICC, and finally to recent state practice and jurisprudence. The text sets out conclusions about the legal elements of the crime and contends that the raison d'être of the crime is located not in the inhumanity of its authors’ actions but in the extent to which its authors threaten international peace and security so as to justify international intervention. With a foreword by Geoffrey Robertson QC.