John C. Haltiwanger, Professor of Economics at the University of Maryland, received his PhD from the Johns Hopkins University in 1981. After serving on the faculty of UCLA and Johns Hopkins, he joined the faculty at Maryland in 1987. In the late 1990s, he served as Chief Economist of the U.S. Census Bureau. He is a Senior Research Fellow with the Longitudinal Employer Household Dynamics Program at the Bureau of the Census and a Research Associate of the Center for Economic Studies at the Bureau of the Census and of the National Bureau of Economic Research. His recent research has exploited the newly created longitudinal establishment data bases and the longitudinal matched employer-employee data bases that are available at the Bureau of the Census. This research centers on the churning of firms, jobs, and workers in the U.S. economy and the implications of this churning for U.S. productivity growth and the dynamics of the labor market. He has published more than 80 academic articles and numerous books including Job Creation and Destruction (with Steven Davis and Scott Schuh, MIT Press) and Economic Turbulence: Is a Volatile Economy Good for America? (With Clair Brown and Julia Lane, University of Chicago Press).