• Legal and EU Policy Counsel of the Christian Democratic Party's Vice-Chairman at the German Federal Parliament (Bundestag) and at the Länder-Parliament of Northrhine-Westphalia (Landtag), without party affiliation
  • International Affairs Officer of the German Chamber of Auditors (i.e. German equivalent of Chartered Accountants) with responsibilities concerning EU, FASB, IASB, GATS, WTO related legislation and bilateral relations with other EU- and Non-EU-countries
  • Head of the Regional Office of the German Chamber of Auditors for the 5 Northern Länder of Germany
  • Team Leader (Head of EU Project on site) and Key Senior Legal Adviser (Head of Legal) of EU legal approximation and harmonisation projects of the European Commission in EU candidate countries and in association countries (i.e. Baltics, Eastern Europe, Balkans, Malta, Turkey) in cooperation with KPMG, Berenschot International/NL, IBF/B, German Foundation for International Legal Cooperation/GER and others
  • Partner of Dr. Denkl & Partner, attorneys at law, tax consultants, chartered accountants, Duesseldorf, member of HLB network 
  • Head of Legal Department Europe Africa Region (Senior Management) of a Fortune 500 multinational group company
  • Founder of the Law office Luters-Thümmel with further representations in Riga/Latvia and Brussels/Belgium in cooperation with Kronbergs Čukste Levin and Keuleneer, Vanneste, Van Varenbergh, Verhelst, Derveaux
  • Founding Partner of the Expert Platform 'Compliance Complicen' www.complicen.cc