worked from 1971 to 1987 as legal counsel in the joint legal department of the German Medical Association and the National Association of Statutory Health Insurance Physicians. He then served as general manager of the National Association of Statutory Health Insurance Physicians until 2003. From 2004 to 2012 he was the impartial chairman of the G-BA. After this activity, he was appointed by the Board of Trustees of the German Organ Transplantation Foundation (DSO) to serve as its interim board for one year