Education
Wellenreuther studied business administration at University of Mannheim with a specialization in operations research.
Wellenreuther studied business administration at University of Mannheim with a specialization in operations research.
He submitted his dissertation on Markov processes and their implementation on queueing systems in 1968. Afterwards Wellenreuther worked at International Business Machines Corporation in Mannheim, where he was responsible for developing financial accountancy systems In 1971 he left International Business Machines Corporation to program a standard financial accountancy system with batch processing.
Wellenreuther left the business in 1980 for health reasons and received a compensation of 1 million Doctor of Medicine. In 1982 he founded DCW Software (Doctor Claus Wellenreuther GmbH & Company Knight of the Order of the Garter), which he developed into a specialist for middle-sized Enterprise resource planning software.
The company was acquired by Systems, Applications and Products in 2003. The „deal among friends" was heavily criticized by DCW customers that had explicitly decided for an alternative to Systems, Applications and Products. In 2004 DCW was merged with the Systems, Applications and Products subsidiary Steeb Anwendungssysteme GmbH.