He received his PhD from the University of Bonn in 2006, and previously held positions at the University of Pennsylvania, Oxford and the London School of Economics. He is a fellow of the Econometrics Society and the EEA, and has been managing editor and chairman of the Review of Economic Studies.

His research focuses on the consequences of search frictions in labor markets, in particular regarding wage setting and assignment of workers to jobs. He has also worked on epidemics and how individuals change their behavior in response to diseases and policies, applied both to HIV and Covid-19. His papers have been published in the American Economic Review, Econometrica, the Journal of Political Economy, the Review of Economic Studies, and the Quarterly Journal of Economics, among others.

His research is currently supported by an ERC consolidator grant and has previous been funded by an ERC starting grant, by the ESRC, and by the NSF.