Timothy G. Ferris, M.D., M.P.H., is chief executive officer of the Massachusetts General Physicians Organization and professor of medicine at Harvard Medical School. He is trained in internal medicine and pediatrics and a practicing primary care physician at Mass General. His prior positions include senior vice president for population health at Partners HealthCare, medical director of the Mass General Physicians Organization, and vice president for quality for the MGH department of pediatrics. His clinical interests include caring for medically complex patients and home visits to the elderly. Tim led the design and implementation of systemwide care delivery changes at Partners in response to novel risk-sharing contracts for Medicare, commercial, and Medicaid populations. He is currently a member of the Secretary of Health and Human Services independent advisory council on physician payment policy.