The purpose of this paper is to expand understanding of academic-practitioner knowledge-sharing in the service of enhanced knowledge creation in health care. To this end, we describe the tacit and explicit knowledge of academics and practitioners and how this knowledge exists within their communities of practice. We also discuss benefits of, difficulties with, and some underlying dynamics of academic-practitioner knowledge-sharing. We then propose what might be done, based on appreciation of these dynamics, to foster joint knowledge-sharing and knowledge creation. We illustrate our arguments with examples from health care settings.