The One Health High-Level Expert Panel is the scientific and strategic advisory group to the Quadripartite organizations - the Food and Agriculture Organization of the United Nations (FAO), the United Nations Environment Programme (UNEP), the World Health Organization (WHO) and the World Organisation for Animal Health (WOAH) – in their collaboration on One Health. Following the launch of the One Health Joint Plan of Action and its implementation guide the Quadripartite collaboration has prioritized support to countries in its roll out. In this regard, the Terms of Reference for OHHLEP were revised and a Call for Experts was issued for Term II with a vision to augment the panel to provide advisory across all action tracks of the OH JPA and utilizing the three pathways to change.