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Mathias joined the ifo Institute in July 2017 as Deputy Director of the ifo Center for Macroeconomics and Surveys. From 2013-2017, he was Senior Researcher at ZEW Mannheim. He joined IZA as a Research Affiliate in September 2009 when he was a fellow of the Cologne Graduate School in Management, Economics and Social Sciences. He became a Research Associate in October 2011 and continues to cooperate with IZA as a Research Fellow.
Mathias has been involved in various research projects conducted on behalf of national ministries, the European Commission, the European Parliament, the European Central Bank and the OECD. His research interests include empirical public economics and fiscal policy, with particular reference to taxation, social insurance, redistribution and inequality.