Kaiser Permanente has implemented the largest nongovernmental electronic health record in the world, servin more than 8.6 million Kaiser Permanente members. Called KP HealthConnect, its impact on patient care outcomes, efficiency, safety, and patient engagement and satisfaction already is of intense interest throughout the health care industry. In this volume, Louise L. Liang, MD, who led the massive KP HealthConnect implementation, collects lessons learned from the organization’s successfull deployment strategy and highlights ways in which the new technological tools are changing and improving the health care provided to patients and the operations and culture of the organization.