He is President of the Global Labor Organization (GLO); Co-Director of POP at UNU-MERIT; Full Professor of Economics at Bonn University (em.); Honorary Professor, Maastricht University, Free University of Berlin and Renmin University of China; Member, German Academy of Sciences Leopoldina, Regional Science Academy, and Academia Europaea. Editor-in-Chief of the Journal of Population Economics. Spring 2019, he has been the George Soros Visiting Professor, School of Public Policy, Central European University (CEU), Budapest. Among others, he has worked before at the Universities of Melbourne, Princeton, Harvard, Bonn, Munich, Kyoto, Mannheim, Dartmouth College and University of Pennsylvania. He has published widely in top academic journals, is committed to the diffusion of research to policy and society, writes regularly in leading international media and advises governments and institutions.