This proceedings summarizes the presentations and discussions that took place at the workshop, Exploring Early Childhood Care and Educations Levers to Improve Population Health. The workshop was organized around three panel sessions consisting of presentations and panel discussions. Each panel session was followed by a "gallery walk" that gave participants the opportunity to reflect on the panel discussion with other attendees and respond (in writing) to specific questions that were posed on posters in a meeting room adjacent to the auditorium where the workshop took place. Upon reconvening in plenary session, the session moderators reported and summarized individual participants' comments from the gallery walk. The first panel explored some aspects of the evidence available at the intersection of health with early care and education, including examples of what works in practice and at the policy level to influence children's health and development/educational outcomes (Chapter 2). The second panel shared lessons learned from cross-sector collaborations in the health and early care and education sectors (Chapter 3). The final panel focused on policy challenges and opportunities, including issues related to financing, the workforce, and equity (Chapter 4). The workshop concluded with summary remarks and reflections on the discussions by Isham and Meadows (Chapter 5). The appendixes to the proceedings include an overview of the input shared in individual participant comments during the gallery walk interactive portions of the workshop and a compendium of links and citations pertaining to the many programs described or mentioned by the day's presenters. (author abstract)