1981-1982: Employee at the University of Heidelberg
1982-1989: Research fellow at the Öko-Institut, Freiburg
1989-1990: Researcher and head of financial department at the Institute for Environmental Policy (IEEP), Bonn
since 1990: Researcher at the IÖW
1991-1998 and 2000-2021: Head of the research field Ecological Product Policy
Evaluation and Assessment, Innovation and Technology, Sustainable Corporate Governance, Products and Consumption, Environmental Policy and Governance
Integrated Product Policy (IPP), Environmental and Social Labeling, Life Cycle Assessment (LCA), Innovation and Diffusion of Ecologically Sound Technologies and Products, Evaluation, Sustainable Production and Consumption (SCP)