Memberships: Council of Economic Advisors to the German Federal Government 1974-78; Advisory Council on Consumer Policy to the Federal Ministry of Economic Affairs; Board of Stiftung Warentest 1975-84; Editorial Board of Journal of Consumer Policy 1977-95
In April 2004, a facial cream marketed by German actress Uschi Glas received a devastating rating, because the cream caused pimples and rash for people with sensitive skin, and the producer sued the foundation.
In 1981, he was appointed member of Stiftung Warentest's Advisory Council, and then between 1992 and the end of 1994 he was a member of the Foundation's Board.