- President of the Deutscher Baugerichtstag e.V. (DBGT)
(Member of the Board of Directors since 2006) - Member of the Board of Directors of the Institut für Baurecht Freiburg im Breisgau e.V. (Institute of Construction Law Freiburg im Breisgau)
- Expert member of the Advisory Board of the Centrum Deutsches und Internationales Baugrund- und Tiefbaurecht e.V. (CBTR) (Centre for German and International Building Site and Civil Engineering)
- Member of the working group “Bauvertragsrecht” (Construction contract law) of the German Federal Ministry of Justice
- Member of the Board of Directors of the International Construction Law Association (ICLA)
- Member of the Board of Directors of the Anglo-German Construction Law Platform (AGCLP)
- Fellow of the International Academy of Construction Lawyers (IACL)