His professional career began after completing an apprenticeship with a tax consultant and after graduating from the University of Applied Sciences in Osnabrück with a degree comparable to the US M.B.A.
- 2002 Appointment as Vereidigter Buchprüfer (German enrolled public accountant) by the German Chamber of Certified Public Accountants
- 1994 Partner at „Gehring & Partner Wirtschaftsprüfer, Steuerberater und Rechtsanwälte“
- 1994 Appointment as Steuerberater (German appointed tax consultant) by the Ministry of Finance of Lower Saxony, Germany
- 1991 Staff member in an accounting firm that was focused on mid-sized companies in Osnabrück, from where he moved to a similar practice in Lingen (Ems), Germany at the end of 1992