His professional career began after he graduated from the University of Mannheim with a degree that is comparable to the US M.B.A.
- 2002 Appointment as Wirtschaftsprüfer (German-certified public accountant) by the Wirtschaftsprüferkammer (German Chamber of Certified Public Accountants)
- 2001 Partner at „Gehring & Partner Wirtschaftsprüfer, Steuerberater und Rechtsanwälte“
- 1996 Appointment as Steuerberater (German appointed tax consultant) by the Ministry of Finance of Lower Saxony, Germany
- 1991 Staff member and later manager in an international accounting firm in Bremen (until 1996) and Oldenburg, Germany