The issue of public health ethics has received much attention in recent years and is seen as a new field, distinct from medical ethics. Faculty from the University of Virginia, Johns Hopkins School of Public Health, Georgetown University, the University of Minnesota, and others received a grant from the Greenwall Foundation to examine this new field of public health ethics and identify the unique principles that distinguish it from the study of medical ethics. In the course of that study, which included exploring the field with public health practitioners, a number of distinguishing ethical principles emerged. The moral principles appropriate for public health officials included producing benefits; avoiding, preventing and removing harms; producing a maximum balance of benefits over harms; and distributing benefits and burdens fairly.