Heinrich Himmler was a leading member of the Nazi Party and one of the main architects of the Holocaust. As the head of the SS (Schutzstaffel), he played a critical role in the establishment and operation of concentration camps, the implementation of mass extermination policies, and the organization of various state-sponsored acts of violence against Jews and other groups deemed 'undesirable'. His influence extended to the planning of systematic genocide during events such as the Wannsee Conference.