David S. Johnson, a member of the Washington Center for Equitable Growth’s Research Advisory Board, is the director of the Panel Study of Income Dynamics and a research professor at the University of Michigan. 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.