Director, Energy Division, Economic Commission for Europe since 1986. Deputy Director, 1981-1986, Chief of Unit on General Energy Problems, 1977-1986, Secretary, Coal Committee(s), 1966-1977, Economic Commission for Europe, Geneva. Science(s) Assistant, European Integration Department, Association of Ruhr Coal Mining Industry, Germany, 1962-1966.
Science(s) Assistant, Board of Managers, Saarberg Coal Mining Company, Germany, 1961-1962. Science(s) Assistant, Institute of European Statistics, University of Saarbrucken, Germany, 1960-1961.