Risto is professor of Statistics at the University of Helsinki. Previously: Research Professor, the Social Insurance Institution of Finland, Professor of Statistics, University of Jyväskylä, Director of Social Statistics, Statistics Finland, and Director of Research, Statistics Finland. Elected member of the International Statistical Institute. Involvement in: Steering Committee of European Working Group on Small Area Estimation, Zensuskommission, Statistisches Bundesamt (Germany), and Steering Committee of the Baltic-Nordic-Ukrainian Network on Survey Statistics. Past President of the Finnish Statistical Society. Papers on: survey statistics, small area estimation and the analysis of complex survey data. He has been involved in international research projects in statistics, funded e.g.by the European Commission. Textbooks on statistics and survey sampling, methodological and empirical research papers in international journals. Associate Editor for international journals in statistics.