The Galway Consensus Conference articulated key definitions, principles, values, and core domains of practice as the foundation for the diffusion of health promotion across the globe. The conference occurred in the context of an urgent need for large numbers of trained health workers in developing countries, which face multiple severe threats to the health of their people. In this article, the authors draw on the experience acquired by the health promotion profession in the United States to illustrate what might be done to build health promotion capacity in developing countries. They examine the profession's experience in the areas of accreditation and certification, research and publications, advocating for the profession, and advocating for public health policy. Finally, the authors direct a challenge to the profession in the United States to extend a hand to developing countries to assist them in expanding their capacity to prepare health promotion professionals and deliver health promotion services.