Professor for economics at the Swiss Federal Institute for Technology and director of the Institute for Environmental Decisions. Formerly head of the Center for Economic Research, ETH Zurich (until 2006) and Professor in Regensburg and Tübingen (1990–1992). Memberships: Advisory Council at the Federal Ministry for Economic Cooperation and Development (since 1992); German Research Foundation (Principal Committee, Senate, Board of Governors - since 1999); Advisory Board of the Center for Research on Environmental Decisions (since 2003); Commission Suisse pour le Questions Conjuncturelles (since 2005); Association for Social Policy and the American Economic Association; Swiss National Science Foundation (1994-2004). Member of the WBGU since 2000. Vice chair 2003-2004, Chair 2004–2008.