| since 2017 | DPO, DPA, IT-Security and IT-Strategy Consultant |
| 2004-2016 | IT-Manger Infrastructure Europe, later Director Infrastructure Europe, Director Global IT-Operations and Director Global IT-Policies & Data Governance in a US-American enterprise (Packagingindustry) |
| 2003-2004 | Head of IT of a producing company (textile industrie) |
| 1995-2003 | Head of IT and IT-Manager Germany of a producing company (metal constructions) |
| 1992-1995 | Freelance developer and lecturer for further education institutions |
| 1979-1991 | Air Force Service (Radar Supervision Service) |
| 1976-1979 | Apprenticeship (mechanic) |
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