2015
The Power of Numerics, FU Berlin
2014
Schnelle Löser für partielle Differentialgleichungen, Oberwolfach
Virtual Medicine, BJUT Summer School, Beijing University of Technology (BJUT), China
Inverse Problems, Fethiye, Turkey
Recent trends and future development in Computational Science and Engineering, Plön
2013
Numerics and Scientific Computing, Bruchsal
Workshop on 10 Years Radon Institute of the Austrian Academy of Sciences, University of Linz, Austria
2012
Symposium on Computational Mathematics and Applied Mathematics, Beijing University of Technology (BJUT), China
Advances in Numerical Methods for PDEs, Technische Universität Berlin, Germany
International Conference on Applied and Computational Mathematics, Middle East Technical University (METU), Ankara, Turkey
International Conference on Numerical Analysis and Applied Mathematics (ICNAAM 2012), Kos, Greece
European Multigrid Conference (EMG), Schwetzingen, Germany
IMS-IMI Joint Workshop on Mathematics for Industry: Biological and Climatic Prospects, Singapore
2011
Department of Mathematical Sciences, KAIST, Daejeon, Korea
Advances in the Numerical Solution of Constrained Differential Equations, University of Britisch Columbia, Vancouver, Canada
7th International Congress on Industrial & Applied Mathematics (ICIAM), Vancouver, Canada
2010
Collatz-Woche (Festveranstaltung zum 100. Geburtstag von Lothar Collatz), Fachbereich Mathematik, Universität Hamburg
8th International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2010) in honor of my 65th birthday, Rhodes, Greece
International Workshop on Numerical Mathematics: Theory, Methods and Applications, Nanjing University, Nanjing, China
6th International Symposium on Measurement & Kinetics of In Vivo Drug Effects, Noordwijkerhout, The Netherlands
2009
International Workshop on Molecular Kinetics 2009, FU Berlin
2008
ICM-Matheon Workshop "Mathematics for key technologies and innovation", ICM Warsaw, Poland
12. Berliner Kolloquium der Gottlieb Daimler- und Karl Benz-Stiftung "Ist Schönheit messbar?", Akademie der Konrad-Adenauer Stiftung Berlin
4th International Bernd-Spiessl-Symposium for Innovative and Visionary Technologies in Cranio-Maxillofacial Surgery, Basel, Switzerland
EuroScience Open Forum - ESOF 2008, Barcelona, Spain
Conference on Modelling, Simulation and Optimization of Complex Processes, University of Heidelberg
International Conference on "Chemical Kinetics of Complex Systems", Veranstalter: Deutsche Akademie der Naturforscher Leopoldina, Universität Karlsruhe und Universität Heidelberg, Bad Herrenalb
International Conference on "Scientific Computation - Complexity, Algorithms & Application", Max Planck Institute for Mathematics in the Sciences, Leipzig
2007
Airline Forum 2007, Dresden
eScience Meeting 2007, SINTEF, Winter Schools in Computational Mathematics, Geilo, Norway
2006
Myanmar-Germany Workshop on Computational Science, University of Yangon, Myanmar
International Conference on Multifield Problems, University of Stuttgart
Conference on Multiscale Problems: Modeling, Adaptive Discretization, Stabilization Solvers, Cortona, Italy
International Conference on Multilevel Methods, Peking University, Beijing, China
European Conference on Mathematics for Industry (ECMI 2006), Leganés (Madrid), Spain
8th Congress of SIMAI (Societá Italiana di Matematica Applicata e Industriale), Baia Samuele (Ragusa), Sicily, Italy
International Conference on High Performance Scientific Computing, Vietnamese Academy of Science and Technology, Hanoi, Vietnam
Conference on Scientific Computing (CoSComp), University of Vienna, Austria
2005
Modelling of Physiological Flows - MPF 2005, Instituto Superior Tecnico, Portugal
ScArt4 - Science and Art 4th International Symposium, Rutgers University, New Jersey, U.S.A.
Adaptivity and Beyond: Computational Methods for Solving Differential Equations, Vancouver, Canada
Advances in Numerical Mathematics, Russian Academy of Sciences, Moscow, Russia
Differential Equations: From Theory to Computational Science and Engineering, ETH Zürich, Switzerland
Bildwelten der Weltbilder, Berlin-Brandenburgische Akademie der Wissenschaften, Berlin
2004
Modern Computational Methods in Applied Mathematics (MCM), Bedlewo, Poland
Mathematics and Culture in Europe, University of Bologna, Italy
2003
Numerical Techniques for Optimization Problems with PDE Constraints, Oberwolfach
High Performance Scientific Computing, Hanoi, Vietnam
Schnelle Löser für partielle Differentialgleichungen, Mathematisches Forschungsinstitut Oberwolfach
ICIAM 2003, Sydney, Australia
Conference on Modelling Cellular Function, Auckland, New Zealand
Inverse Problems: Computational Methods and Engineering Applications, Institute for Pure and Applied Mathematics (IPAM), UCLA, Los Angeles, U.S.A.
2002
Conference on Scientific Computation, Geneva, Switzerland
Molecular Modeling and Computation, California Institute of Technology, Pasadena, U.S.A.
2001
Mathematical Modeling and Scientific Computing, Ankara, Turkey
6th SIAM Conference on Applications of Dynamical Systems, Snowbird, Utah, U.S.A.
Joint BMS-DMV 2001 Meeting, Liège, France
Chemistry and Mathematics: Two Scientific Languages of the 21st Century, MPI für biophysikalische Chemie, Göttingen
2000
Matematica, Ciencia y Sociedad, Valladolid, Spain
Multiscale Computational Methods in Chemistry and Biology, Eilat, Israel
Trends in Nonlinear Analysis (TiNA 2000), Heidelberg
Macromolecular Modelling, Courant Institute, New York University, U.S.A.
2000 - The Year of Mathematics, Hungarian Academy of Sciences, Budapest, Hungary
1999
Quantum Transport Models and Dispersive Problems, Erwin-Schrödinger-Institute, Wien
1998
Conference on Numerical Analysis and Domain Decomposition, Courant Institute of Mathematical Sciences, New York, U.S.A.
Domain Decomposition and Multifield Theories, Oberwolfach
11th International Conference on Domain Decomposition Methods, Greenwich, UK
10th International GAMM-Workshop on Multigrid Methods, Universität Bonn
1997
Mathematische Optimierung, Oberwolfach.
Adaptive Methoden für partielle Differentialgleichungen, Oberwolfach
Algorithms for Macromolecular Modelling, Berlin
Large Time Behavior in Dynamical Systems, Oberwolfach
Multiscale II: Analysis and efficient simulation of multiscale problems, MPI Mathematik in den Naturwissenschaften, Leipzig
Technisch-wissenschaftliches Hochleistungsrechnen, Oberwolfach
1996
International Linear Algebra Year, CERFACS, Toulouse, France
Modelling of Chemical Reaction Systems, IWR, Universität Heidelberg
Fifth European Multigrid Conference, Universität Stuttgart
Dynamical Systems Methods in Fluid Mechanics, Oberwolfach
International Symposium on Optimization and Computation, Fujiama, Japan
1995
Scientific Computation and Differential Equations (SciCADE'95), Stanford, California, U.S.A.
Conference on Multilevel Methods and  Applications, Oberwolfach
8th International Conference on Domain Decomposition Methods (DDM8), Beijing, China
4th International Conference on Advanced Numerical Analysis, Moscow, Russia
BMBF "HPSC 1995'', KFA Jülich
1994
Mathematisches Institut, Technische Universität München
ECMI 94, Universität Kaiserslautern
Adaptive Techniques for Scientific Models, University of Warsaw, Poland
1993
Scientific Computation and Differential Equations, Auckland, New Zealand
Advances in Computational Mathematics, New Delhi, India
International Meeting on Linear/Nonlinear  Iterative Methods and Verification of Solution, Matsuyama, Japan
Adaptive Methoden für  partielle Differentialgleichungen, Oberwolfach
7th Intern. Conf. on Domain Decomposition Methods, Pennsylvania State University, U.S.A.
1992
Mathematische Modellierung und Simulation elektrischer Schaltungen und Halbleiter, Oberwolfach
Int'l. Conference on the Computation of Differential Equations and Dynamical System, Beijing, China
Abschlußkolloquium SFB 123,  Heidelberg
1991
Conference on Numerical Optimization Methods in Differential Equations and Control, Raleigh, U.S.A.
International Conference on Domain Decomposition, Lambrecht
Reliability and Adaptive Methods in Computational Mechanics, Krakow, Poland
1990
Copper Mountain Conference on  "Iterative Methods'', Denver, U.S.A.
1989
European Symposium on Computer Applications in Chemical Industry, Erlangen
Preconditioned Conjugate Gradient  Methods , Nijmegen, Holland, The Netherland
Numerical Methods in Optimization and Optimal Control, Trier
13th Biennial Conference on Numerical Analysis, Dundee, Scottland, UK
5th Internationales Symposium on Numerical Methods in Engineering, Lausanne, Switzerland
1988
4. GAMM-Seminar "Efficient numerical methods for PDE´s'', Kiel
Numerical Solution of Initial Value Problems for Ordinary Differential Equations, Toronto, Canada
1987
Numerische Methoden für Anfangs- und Anfangsrandwertprobleme, Oberwolfach
1986
SIAM, Southeastern Atlantic Section, Distinguished Lectures, Atlanta, U.S.A.
Bunsentagung, Ges. f. Physikalische Chemie, Heidelberg
1985
Mathematical Aspects of the  Road-Vehicle System, Lambrecht, Pfalz
1984
Applications of Mathematics in Technology, Rome, Italy
1982
Stiff Computation, Park City, U.S.A.
SIAM 30th Anniversary Meeting, Stanford, U.S.A.
1981
Numerical Methods for Solving Stiff Initial Value Problems, Oberwolfach
Gatlinburg 8, Numerical Linear Algebra, Oxford, U.K.
1980
Modelling of Chemical Reaction Systems, Heidelberg
1979
ACM--SIGNUM "Numerical Ordinary Differential Equations", Urbana, U.S.A.
Numerical Methods for Initial Value Problems, Stockholm, Sweden
1978
BVP Codes in ODE´s, Houston, U.S.A.
Numerical Methods in Celestial Mechanics, Oberwolfach
Conference on Computational Techniques for Ordinary Differential Equations, Manchester,  U.K.
1977
Dutch Numerical Analysis Meeting, Zeist, The Netherlands
Gatlinburg 7, Symposium on  Numerical Linear Algebra, Asilomar, U.S.A.
1974
Optimization and Optimal Control, Oberwolfach