Kurt C. Stange, MD, PhD is a family and public health physician, practicing at Neighborhood Family Practice, a federally-qualified community health center in Cleveland, Ohio. For more than two decades he’s been learning and applying complexity science principles to try make sense of a world that just doesn’t seem to fit neatly into little boxes and straight paths. He uses complexity science to guide and interpret mixed qualitative and quantitative research, and more recently he has been working on participatory methods to advance community health and to develop agent-based models of primary health care and patient-centered and population health outcomes. He serves as editor for the Annals of Family Medicine, and is an American Cancer Society Clinical Research Professor. At The Institute for Integrative Health, he is a Scholar. He is working on Promoting Health Across Boundaries, and is active in practice-based, multimethod, participatory research and development that aims to understand and improve primary health care and community health. He is a member of the National Academy of Medicine.