1981-1986 Legal Studies at the University of Cologne
1986-1989 Research Assistant at the Chair of Civil Law, Labour Law and Commercial Law (Prof. Dr. Manfred Lieb)
1989-1992 Trainee lawyer at the Higher Regional Court of Cologne and research assistant at the above chair
1990 Doctorate at the University of Cologne, title of doctoral thesis: Geschäftsführungshaftung bei der GmbH & Co KG und das Prinzip der Haftung für sorgfaltswidrige Leitung (Management Liability in a GmbH & Co KG and the Principle of Liability for Mismanagement), Nomos-Verlag Baden-Baden 1991
1992-1996 Research Assistant at the above Chair
1997-1999 Habilitation fellow of the German Research Foundation (DFG)
1999 Habilitation at the University of Cologne, title of habilitation thesis: Sonderverbindung und außerdeliktische Schutzpflichten (Special relationship and non-contractual duties), C. H. Beck Verlag, Munich, 2000
1999 - 2001 Stand-in professorships at the Universities of Mainz, Trier, Köln, Heidelberg, Siegen
2001 Rejection of a call to a professorship at the University of Heidelberg
Since July 2001 Full professor of Civil and Commercial Law at the University of Siegen
Since 2002 member of the Judicial Examination Office at the Higher Regional Court of Cologne
February 2004 - February 2008 Dean of the Department of Economics, Business Informatics and Business Law at the University of Siegen
Since November 2008 spokesperson of the business lawyers of the current Faculty III, Economics, Business Informatics and Business Law
March 2010 – February 2011 and since March 2021 Senator of the University of Siegen
Since March 2011 Vice Dean for Research, Faculty III of the University of Siegen
February 2013 – January 2019 member of the university council of the University of Siegen
2015 – 2019 Vice Dean for Teaching, Faculty III at the University of Siegen
June 2016 – Establishment of the research group “Contract Governance and Contract Negotiation” in cooperation with Prof. Dr. iur. Stefanie Jung (now TUM, Campus Heilbronn)
