1. Senior Fellow, Urban Institute, Co-director, Tax Policy Center, and Research Professor, Georgetown University Public Policy Institute, all in Washington, D.C.
2. Arjay and Frances Fearing Miller Chair, Brookings Institution, and Co-director, Tax Policy Center, both in Washington, D.C.
3. Research Associate, Urban Institute, and Director of Tax Modeling at the Tax Policy Center, both in Washington, D.C.