Mark A. Zezza, Ph.D., is a vice president in the Lewin Group's federal health and human services practice. Previously, he was an assistant vice president for The Commonwealth Fund's Delivery System Reform & Cost Control programs. Dr. Zezza joined the Fund from the Engelberg Center for Health Reform at the Brookings Institution, where he was a research director responsible for provider payment and delivery system reform projects. Prior to Brookings, Dr. Zezza was an associate director at the Lewin Group, working as a member of the state health care reform team to analyze the economic and coverage effects of reform proposals. He also conducted analyses on the impact of Medicare payment policy. From July 1999 through 2006, he worked at the Centers for Medicare and Medicaid Services in Baltimore. He holds a B.S. in Math and Psychology from Dickinson College, and a Ph.D. in Public Policy from University of Maryland, Baltimore County.