Theo Vos, MD, PhD, is Professor of Health Metrics Sciences at the Institute for Health Metrics and Evaluation. He is a key member of the Global Burden of Disease research team, and is working to improve the methods, update sources of data, and develop partnerships with countries to produce estimates that are most relevant to policy decision-making. Dr. Vos is the lead faculty on all issues related to non-fatal estimates, including severity distributions and the derivation of disability weights.