William Kassler, MD, MPH, is currently Deputy Chief Health Officer and Lead Population Health Officer at IBM Watson Health. Prior to that he served as Chief Medical Officer for the New England Region of the Centers for Medicare and Medicaid Services (CMS), where he worked with the CMS Innovation Center to implement value-based purchasing initiatives to improve population health outcomes.

Dr. Kassler has served as State Health Officer and Medical Director for the New Hampshire Department of Health and Human Services integrating population-based public health strategies and preventive services into clinical care through programmatic collaboration between public health and Medicaid. Dr. Kassler received his MD from the University of Massachusetts Medical School and is board certified in internal medicine. He received an MS in nutrition from Case Western Reserve University and an MPH from the University of California, Berkeley.