Charles R. Hulten is a professor of economics at the University of Maryland. He has been a senior research associate at the Urban Institute and is chair of the Conference on Research in Income and Wealth of the National Bureau of Economic Research. Edwin R. Dean, formerly an associate commissioner for Productivity and Technology at the Bureau of Labor Statistics, is an adjunct professor of economics at The George Washington University. Michael J. Harper is the chief of the Division of Productivity Research at the Bureau of Labor Statistics.