Dale T. Mortensen is the Niels Bohr Visiting Professor of Economics at Aarhus University, a research associate of the National Bureau of Economic Research (NBER), and an IZA Research Fellow. He received his BA in Economics from Willamette University in 1961 and his PhD in Economics from Carnegie-Mellon University in 1967. Mortensen is a fellow of Econometrica Society, the American Academy of Arts and Sciences, the Society of Labor Economics, and the European Economic Association. He was awarded the Society of Labor Economics Mincer Prize in 2007 and elected an American Economic Association Distinguished Fellow in 2008. Among his publications are over fifty scientific articles and his book Wage Dispersion: Why Are Similar Workers Paid Differently? Christopher A. Pissarides holds the Norman Sosnow Chair in Economics. He specialises in the economics of unemployment, labor market theory and policy, and economic growth and structural change. Pissarides has published extensively in professional journals and his book Equilibrium Unemployment Theory is a standard reference in the field. He is President Elect 2010 of the European Economic Association, Fellow of the British Academy, the Econometric Society, the European Economic Association and the Society of Labor Economists. His editorial activities include the chair of the Economica board, and membership of the editorial board of the AEJ: Macroeconomics and other journals. He is research fellow of IZA, the Centre of Economic Performance at LSE, and the Centre for Economic Policy Research (CEPR London).