• Board ESWE Versorgungs AG, Wiesbaden (seit 2023). 
• Board (deputy) WVV Wiesbaden Holding GmbH (seit 2023). 
• Member of City Parliament Wiesbaden (since 2022 und 1996-2000). 
• Advisory Board Raquest GmbH, Raubling (since 2022). 
• Member of scientific board of ´New Energy Law (Zeitschrift für Neues Energierecht – ZNER)´ (since 2014) and ´Energy and Competition Law (Zeitschrift für Energie und Wettbewerbsrecht – EweRK)´ (since 2014). 
• Member of the Board of the mutual savings bank NASPA, Wiesbaden (since 2011). 
• Member of scientific board of the German Federal Government Committee ´Reform of Local Taxation´ (“Gewerbesteuerreform”) (2002-2003). 
• Member of the German Federal Government Committee ´Reform of Corporate Taxation´ (“Unternehmen-steuerreform”), which has elaborated the German Tax Reform 2001-2005 (1998-2001). 
• More than 50 projects in the fields of energy systems; new information technologies; economic and eco-logical evaluation of infrastructure investments; international comparison of taxation and influence on in-vestments and jobs. On behalf of European Union, German Federal, Länder and Local Governments, private companies and citizens´ initiatives (since 1986). 
• Professor of Economics and Business Administration at the RheinMain University Wiesbaden, FRG (1986-2016); Vice-Dean (1988-1991); Dean 1991-1993). 
• Many Invitations as an expert by the European Parliament, the European Commission, OECD and several committees of Deutscher Bundestag (since 1980). 
• Advisory board of ATW-Research, Wiesbaden, Germany (since 1986). 
• Managing partner of a consulting company in Regensburg/FRG. Manifold work abroad, on behalf of World Bank, OECD/IEA, European Commission, German Government, private companies (1981-1986). 
• Lecturer at the University and the College of Regensburg, FRG in the fields of energy economics and business administration (1981-1986). 
• Managing director for several research projects (up to 10 employees) on behalf of the International Energy Agency, OECD and German Federal Ministry on Research and Technology (1977-1980). 
• Ph.D. about integration of wind energy (1977-1980). 
• M.S., School of Enginering, Stanford University, major renewable energies