is Professor of Macroeconomics at the Free University of Berlin and Head of the Macroeconomics Department at DIW Berlin. Before that, he was a Max Weber Fellow at the European University Institute, Junior Professor at the Rheinische Friedrich-Wilhelms-Universität in Bonn and Professor of Monetary Macroeconomics at the Martin Luther University Halle-Wittenberg.
In his research, he empirically analyzes the effects of monetary and fiscal policy on the economy, for example on private and public interest rates, gross domestic product and inflation. An important aspect of his research that mainly determines the impact of policies is household expectations. His research is published in leading journals, including the Economic Journal, the European Economic Review and the Journal of Applied Econometrics. He has been a member of the editorial board of the journal European Economic Review since 2017.