Per Johansson is since 1999 employed as a researcher at IFAU. He has had a chair in micro econometric evaluation at the Department of Economics, Uppsala University (2002) and is currantly Professor at the Department of Statistics. He has a Philosophy Licentiate (1992) from the Stockholm School of Economics and a Ph.D. (1993) from Umeå University. His research deals with the analysis of micro data in general (both methodological and applied). The applied work has mainly been in labor economics (effects of income security systems on labor market behavior, program evaluation, and economics of education) but he has also done research in transport economics. Publications include papers in Journal of Econometrics, Journal of European Economic Association, Journal of Business and Economic Statistics, Journal of Public Economics, Journal of Human Resources and Transportation Research.