Martin Kahanec is Associate Professor and PhD track representative (Public Policy) at the Central European University in Budapest and founder and Scientific Director of the Central European Labour Studies Institute (CELSI) in Bratislava. At the same time Kahanec is Visiting Research Fellow, Deputy Program Director "Migration", the leader of the research sub-area EU Enlargement and the Labor Markets and former Deputy Director of Research (2009) at the Institute for the Study of Labor (IZA) in Bonn, Germany. He has held several advisory positions and leading roles in a number of scientific and policy projects with the World Bank, the European Commission, and other international and national institutions. Among his publications are various contributions to the economics of migration. Klaus F. Zimmermann is Director of the Institute for the Study of Labor (IZA) in Bonn, Germany as well as Full Professor of Economics at the University of Bonn and Honorary Professor at the Free University of Berlin and the Renmin University of China. Among others he serves as fellow of various scientific institutions and member of the Academia Europaea, the German Academy of Sciences Leopoldina, and the World Economic Forum's Global Agenda Council on Migration. Zimmermann regularly advises the World Bank, the European Commission, the European Parliament and governments on the national and international level. Migration and labor mobility are at the core of his intensive research and policy advice activities. His numerous publications in the field cover all aspects of worldwide migration flows, ethnic diversity, and labor market integration.