Assault directed against psychiatric staff is emerging as a serious occupational health problem. Governmental regulatory agencies, unions, and academic research have identified workplace assault in the psychiatric setting as a serious workplace health issue. 2. Violence directed against psychiatric nursing personnel is increasing. Increases in assault are related to shorter hospitalizations, cutbacks in mental health services, and the increasing number of clients with criminal histories and personality disorders. 3. Reduction in staff assault can best be accomplished using an injury epidemiology occupational health focus. Identifying hazards, energy transfer mechanisms, and other environmental factors contributing to staff injuries can reduce or eliminate the morbidity associated with client assault.