Warsaw University, PhD Political Sciences (1990);
Head of Electoral Studies Section, Polish Academy of Sciences, Institute of Political StudiesPolitical Studies, (1991-); vice-chair of Department of Political Science, Warsaw School of Social Psychology; lecturer at the Collegium Civitas, Warsaw;
Director and principal investigator of the Polish National Election Study (1996-); member of the Planning Committee of the Comparative Study of Electoral Systems (ICORE project, 1997-); member of Editorial Board: Perspectives on European Politics and Society and Central European Political Science Review.
