Health care and public health are finding common—but conflicted—ground in population health. Current discussions in the two fields are collecting a large and growing set of tools, but with little clarity about which are appropriate for exactly what kind of work. Furthermore, neither field provides a clear explanation about how to manage this work within the field, including budgets, job descriptions, and evaluation methods, etc. that distinguish between good and better, efficient, effective or not. The following article offers four linked domains of thought and practice that together constitute a bridge from where we are to where we want to be—healthier people and institutions—by using the idea of the Leading Causes of Life as the supporting paradigm.