This collection of case studies by scholars from a range of disciplinary backgrounds turns a critical and reflective eye toward qualitative fieldwork on the topic. Framed by an introduction that sets out key issues in perpetrator research and a conclusion that proposes and outlines a code of best practice, the volume provides an essential starting point for future research while advancing genocide studies, transitional justice, and related fields. This original, important, and welcome contribution will be of value to historians, political scientists, criminologists, anthropologists, lawyers, and legal scholars.