Head of department of Public Economics at DIW Berlin and Professor of Public Economics at Freie Universität Berlin. Ph.D in Economics with distinction. Studies in Economics and Political Sciences at Albert-Ludwigs-University Freiburg, Humboldt-University Berlin and University of Toronto. Visiting Fellow at LSE, Paris School of Economics, Institute for Fiscal Studies und UCL London. Publications for example in American Economic Journal Macroeconomics, Journal of Public Economics, Journal of Econometrics, Economic Journal, Journal of Health Economics.