John Holahan, Ph.D., is an Institute Fellow in the Health Policy Center at the Urban Institute, where he previously served as director for more than 30 years. His recent work focuses on health reform, the uninsured, and health expenditure growth. He has examined the coverage, costs, and economic impact of the Affordable Care Act, including the costs of Medicaid expansion and the macroeconomic effects of the law. He also has analyzed the health status of Medicaid and exchange enrollees, and the implications for costs and exchange premiums. Dr. Holahan has written on competition in insurer and provider markets and implications for premiums and government subsidy costs as well as on the cost-containment provisions of the ACA. He received a Ph.D. in economics from Georgetown University.