The Practice of International Health is a beautifully conceived and beautifully written book. It offers an inspiring example of what may be accomplished when scholars with field experience break free of rigid disciplinary boundaries in order to examine key problems in international health. This case-based approach is precisely the one that will allow us to build a new field based on broad understandings of these problems and on the solutions that might follow. The need for and vibrant potential of such a focus on practice that resonates in every page of this book signals its profound relevance to students and teachers of public health, and, one hopes, to policy makers and funders.