The participation of German physicians in medical experiments on innocent people and mass murder is one of the most disturbing aspects of the Nazi era and the Holocaust. Six distinguished historians working in this field are addressing the critical issues raised by these murderous experiments, such as the place of the Holocaust in the larger context of eugenic and racial research, the motivation and roles of the German medical establishment, and the impact and legacy of the eugenics movements and Nazi medical practice on physicians and medicine since World War II. Based on the authors' original scholarship, these essays offer an excellent and very accessible introduction to an important and controversial subject. They are also particularly relevant in light of current controversies over the nature and application of research in human genetics and biotechnology.