Full Professor, Chair in Social Interaction and Interdependence, Free University, Amsterdam (2000+)

Honorary Full Professor, Societal Conflicts, University of Leiden (1999+)

Scientific Director of Kurt Lewin Institute, an interuniversity graduate school of social psychology and its applications (2001-2004)

Associate Editor of European Journal of Social Psychology (1998-2001)

Associate Editor of Journal of Personality and Social Psychology (2001-2002; 2007-now)

Member of Policy Advice Committee at Netherlands Organizations of Scientific Research (1999-2003).