2007- : Leader of the Centre of Equality, Social Organization and Performance (ESOP) at the University of Oslo.
l987- : Professor at the University of Oslo.
l987- :Scientific Advisor at the Center of Applied Research, Oslo.
2008- : Board member of Max Planck Institute, Munich.
2002-2012: Group Leader of CSCW at PRIO.
1992-2000: Board member of the Norwegian Research Council, Environment/Development.
1999-2000: Panel member of Economic Policy.
1992-1999: Editor of the Scandinavian Journal of Economics.
1998: Visiting professor in political science and economics, Northwestern University.
1991: Visiting scholar, UCLA.
1982-1983: Visiting scholar, Stanford University.