10/1974 - 03/1979: Chemical Engineering, University of Stuttgart, Germany
11/1988: Dr.-Ing., Faculty of Mechanical Engineering, University of Stuttgart: “Modularisierungskonzepte bei Simulationsproblemen in integrierten Programmsystemen” (Supervisor: Prof. Dr.-Ing. Roland Rühle, Director Computing Center & “Leiter des Lehrbereichs Anwendungen der Informatik im Maschinenwesen“)
03/1979: Dipl.-Ing., University of Stuttgart
2004 - present: C4-Professor for Computer Science, University of Cologne
2004 - present: Director of Regional Computing Centre (RRZK), University of Cologne
2002 - 2004: Deputy Director of Höchstleistungsrechenzentrum Stuttgart (HLRS)
1989 - 2004: Head of Visualization Department, HLRS
1989 - 1989: Visiting Scientist, Center for High Performance Computing, Austin, Texas, USA
1986 - 1988: Research Assistant, Computing Center, University of Stuttgart
1981 - 1985: Research Assistant, Institute for Nuclear Science and Energy Systems, University of Stuttgart
2011 - present: Member of the governing board of DFN e.V. (German Research Network)
2011 - 2014: Chairman of the Board of ZKI e.V. (Directors of the German Academic Computing Centers)
2007 - 2011: Member of the Board of ZKI. e.V.
2011 - 2018: CO-PI of DFG-TRR32 Z1: Data Management and spatial data analysis
2011 - 2014: PI of BMBF-project NGSgosHPC “Next Generation Sequencing on High Performance Computing”
2009 - 2012: PI of BMBF-Project MoSGrid “Molecular Simulation on the Grid”
Professor (C4) and Director of the Regional Computing Center
University of Cologne
Institute for Computer Science and Regional Computing Centre (RRZK) Cologne