- 1985 Business studies graduate from Osnabrück University of Applied Sciences with key study areas being cost accounting and tax law.
- 1990 Accredited as tax consultant
- 1994 Accredited as chartered accountant
- 1986 to 1988 Audit assistant in a firm of chartered accountants/tax consultants in Bad Iburg
- 1988 to 1992 Audit assistant with auditors PwC Deutsche Revision, Osnabrück
- 1993 Partner in the tax consultant firm Wilker und Müller. The chartered accountant/tax consultant firm of Wilker, Müller and Schnüpke GbR is formed.
- German Chamber of Tax Consultants
- German Chamber of Chartered Accountants