Period	Position	Description
08-01-1983 - 07-31-1986	Apprentice	Chemiefacharbeiter at the company ESSO AG, Hamburg
08-01-1986 - 09-06-1987	Skilled worker	employment on time at ESSO AG, Hamburg
09-07-1987 - 10-31-1987	Skilled worker	employment on time at SENATOR Projekt Service GmbH, Düsseldorf
11-01-1987 - 12-31-1998	Skilled worker, shift manager, plant manager, software developer (additional occupation)	employment at HOLBORN Europa Raffinerie GmbH, Hamburg [assessment]
05-01-1994 - 05-31-1997	Software developer	Avocational occupation on demand at Dipl.-Kaufmann Dr. Stefan Schwarz Wirtschaftsprüfer/Steuerberater, Neu Wulmstorf (certified public accountant)
01-01-1999 - 07-30-1999	System engineer	employment at maxheim wirtschaftsinformatik (later mwi holdung GmbH), Buchholz
08-01-1999 - 10-07-1999	System engineer	employment at mwi holdung GmbH, Buchholz
10-08-1999 - 06-30-2001	CEO & share holder, System engineer	employment at mwi hamburg gmbh, Hamburg [assessment]
since 07-01-2001	Senior IT-Consultant	employment at Gauss Interprise Consulting AG later evodion Information Technologies GmbH & Co KG, Hamburg