Johannes Geyer is deputy head of the department of public economics at the DIW Berlin. He received his PhD in Economics from Freie Universität Berlin in 2012. He was also a member of the Graduate Center of the DIW. Between 2012 and 2016 he was a visiting professor at the Humboldt-Universität Berlin in addition to his work at the DIW Berlin. He is an affiliate of the Health Econometrics and Data Group (HEDG) and Netspar Fellow. From 2014 to 2017, he was Ombudsman for good scientific practice. His research focuses on issues of social protection and demographic change. For this he uses empirical methods of microeconometrics and microsimulation.