Public health law research reveals significant complexities underlying the use of law as an effective tool to improve health outcomes across populations. The challenges of applying public health law in practice are no easier. Attorneys, public health officials, and diverse partners in the public and private sectors collaborate on the front lines to forge pathways to advance population health through law. Meeting this objective amidst competing interests requires strong practice skills to shift through sensitive and sometimes urgent calls for action to address known threats to the health of individuals and the community. It also necessitates objective, timely information and national and regional legal support.