David S. Johnson is a senior program officer at the National Academies of Sciences, Engineering, and Medicine and an adjunct faculty at Georgetown’s McCourt School of Public Policy. Prior, he was a research professor at the University of Michigan, Ann Arbor. His research interests include the measurement of inequality and mobility (using income, consumption, and wealth), the effects of tax rebates, equivalence scale estimation, poverty measurement, and price indexes. He also worked for many years in the Federal Statistical System, including experience in administrative data linkages. He holds a Ph.D. in economics from the University of Minnesota.