Head of department of Public Economics at DIW Berlin and Professor of Public Economics at Freie Universität Berlin. Ph.D in Economics with distinction (Supervisors: Prof. Viktor Steiner and Prof. Richard Blundell). Studies in Economics and Political Sciences at Albert-Ludwigs-University Freiburg, Humboldt-University Berlin and University of Toronto (degree: Diplom Volkswirt). Visiting Fellow at Paris School of Economics, Institute for Fiscal Studies und UCL London. Recent publications in Economic Journal, Journal of Health Economics and Econometrics Journal.