- Attorney at law since 1984
- more than 30 years experience as industry lawyer for well known companies (Siemens AG, Siemens-Nixdorf AG, Fujitsu-Siemens GmbH, Solectron GmbH, Airbus Defence and Space GmbH)
- lecturer at the university in Göttingen (US IP/IT law in comparison with German/EU laws) and in Offenburg and Friedrichshafen (national and international IT-, Data Protection- and Cybersecurity Law)
- lecturer for the „DeutscheAnwaltAkademie“ concerning Software Contract Law and Open Source Software
- Member of the German Association of Law and Informatics (DGRI e.V.) since 1998, member of the board of directors from 2002-2010
- Member of the legal advisory committee („Rechtsausschuss“) of the Munich Chamber of Commerce (IHK München und Oberbayern) since 2016
- since 1998 about 80 publications in the field of international IT-, Data Protection-, Contract- and US law including „Der E-Commerce Vertrag nach amerikanischem Recht“, Köln 2001 und „Ullrich/Lejeune (Hrsg.) Der internationale Softwarevertrag, 2. Auflage 2006“