Short CV/Education and training

  • 1995
    Abitur (A-levels); graduated 1 year early (skipped grade 11)

  • 1995 – 1999
    Studied mathematics and chemistry at the University of Cologne, Germany

  • 1998 – 1999
    Student employee, GMD, at the Fraunhofer Institute for Algorithms and Scientific Computing SCAI, Sankt Augustin, Germany

  • Since 1999
    Research associate in the field of linear solvers, GMD, at the Fraunhofer Institute for Algorithms and Scientific Computing SCAI, Sankt Augustin, Germany

  • 1999
    Diplom degree in mathematics with a minor in chemistry at the University of Cologne

  • Since 2002
    Research associate (on permanent contract) in the field of linear solvers (AMG); Chief Software Developer (SAMG) at the Fraunhofer Institute for Algorithms and Scientific Computing SCAI

  • 2004
    Doctor of Natural Science (Dr. rer. nat.) in applied mathematics, University of Cologne

  • Since 2007
    Head of the Robust Design group

  • Since 2011
    Head of the High Performance Analytics department at the Fraunhofer Institute for Algorithms and Scientific Computing SCAI

Selected publications

  • Thum, P. et al.: Efficient algebraic multigrid for migration-diffusion-convection-reaction systems arising in electrochemical simulations. J. Comp. Phys. Accepted.

  • Hornung, N., Nikitina, L., Clees, T.: Multi-objective optimization using surrogate functions. Procs. 2nd Int. Conf. Engineering Optimization (EngOpt), Sep. 6-9, 2010, Lisbon, Portugal.

  • Clees, T. et al.: Statistical analysis and robust optimization of forming processes and forming-to-crash process chains. 13th ESAFORM Conference on Material Forming, Brescia, Italy, April 7-9, 2010. Accepted for publication (Springer).

  • Thum, P., Clees, T.: Towards physics-oriented smoothing in algebraic multigrid for systems of partial differential equations arising in multi-ion transport and reaction models. Procs. 14th Copper Mountain Conference on Multigrid Methods, 2009, March 22-27. Num. Lin. Alg. Appl., NLAA Special Issue. Accepted (Publication 2010).

  • Maaß, A. et al.: Multi-objective optimization on basis of random models for ethylene oxide. J. Molecular Simulation, Special Issue: FOMMS 2009 Conference Proceedings. Accepted (Publication 2010).

  • Helbig, M. et al.: Development of a material model for analyzing stochastic and deterministic influences on the forming to crash process chain. Procs. ANSYS Conference & 27th CADFEM Users' Meeting, Nov. 18-20, Leipzig, 2009.

  • Clees, T., Ganzer, L.: An efficient algebraic multi-grid solver strategy for adaptive implicit methods in oil reservoir simulation. SPE Journal. Society of Petroleum Engineering. Online seit 20.05.2010.

  • Clees, T. et al.: Process chain forming to crash: efficient stochastic analysis. Procs. 7th European LS-DYNA Users' Conference, Salzburg 2009, May 14-15. Dynamore GmbH, 12 pages, 2009.

  • Clees, T.: Towards physics-oriented algebraic multigrid for systems of partial differential equations. Abstracts of MFO Mini-Workshop on Numerical Upscaling for Flow Problems: Theory and Applications, Mar 1-7, 2009, Mathematisches Forschungsinstitut Oberwolfach, Germany, 2009, Report 12/2009, S. 9-11. www.mfo.org.

  • Trottenberg, U., Clees, T.: Multigrid software for industrial applications – from MG00 to SAMG. 100 Volumes of "Notes on Numerical Fluid Mechanics", 40 Years of Numerical Fluid Mechanics and Aerodynamics in Retrospect. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 100, Hirschel, Ernst Heinrich; Krause, Egon (Eds.), Springer, Berlin, 2009. ISBN: 978-3-540-70804-9 (invited paper).

  • Clees, T. et al.: An automatic multi-level solver switching strategy for PEEC-based EMC simulation. Procs. 18th IEEE Int. Zurich Symposium on Electromagnetic Compatibility (EMC-Zurich), Munich, Sep. 26-28, 2007.


Selected projects

  • Several BMBF KMU-innovativ projects with industrial partners (e.g. VIPROFORM, BEPHASYS), 2012 – 2014

  • German Federal Ministry of Education and Research (BMBF) SOFA (mathematics programme), 2010 – 2013

  • AVIF numSTEPS, 2010 – 2013

  • Several ZIM (central innovation programme for small and medium-sized companies) projects under the aegis of the German Federal Ministry of Economics and Technology (BMWI), as project leader of one, 2009 – 2011

  • Deputy project manager, Fraunhofer HIESPANA, www.hiespana.fraunhofer.de, 2008 – 2011

  • Project manager, Fraunhofer CAROD, www.carod.fraunhofer.de, 2007 – 2010

  • BMBF D-Grid-ProGrid, www.progrid.de, 2007 – 2010

  • European Union Seventh Framework Programme (FP7) Bridge, 2007 – 2009

  • Industry projects in the fields of automotives, oil, microelectronics, chemistry, since 2000

Additional qualifications

  • Training courses:

  • Fraunhofer Vintage Class courses (highest level at Fraunhofer: High Potentials)

  • Fraunhofer leadership training (level Q2: aimed at division heads)

  • project management

  • marketing

  • acquisitions

  • conducting negotiations

  • communication

  • entrepreneurial skills (basic business administration)

Lecturing and teaching:

  • Have lectured extensively at conferences and workshops

  • Have exhibited at trade fairs and conferences

  • Have lead seminars, assisted and contributed to lectures

  • Courses and workshops in the fields of auto manufacturing, microelectronics, new materials, flow simulation, software development

Technical skills:

  • Programming languages (C++, modern Fortran, Python), tools (Visual Studio, Qt, Intel, Eclipse), parallelisation (OpenMP, MPI)

  • Windows, Linux, Unix systems


Soft Skills/Other activities and achievements

Additional interests

  • Sports (actively: cycling, Karate, hiking)

  • Society for the preservation of the Wiehltal railroad

  • Science and theology


Soft Skills

  • Married, one son (*2007).

  • Employee leadership with personnel responsibilities, including performance reviews

  • Experience in supervising academic work in mathematics and computer science (Diplom/Master's thesis (university and technical university), dissertation), continously since 2003


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