| 1972 | IBM T.J. Watson Research Center. |
| 1976 | Stanford University, Department of Computer Science. |
| 1978 | Burroughs Corporation. |
| 1978 | Washington State University, Department of Computer Science. |
| 1980 | Massachusetts Institite of Technology, Dept. of Electrical Eng. |
| 1981 | Sandia National Laboratories. |
| 1981 | CREST Course on ``The Design of Numerical Parallel Algorithms,'' Bergamo, Italy. |
| 1981 | CONPAR81, Nurnberg, Germany. |
| 1982 | Argonne National Laboratory. |
| 1982 | Purdue Workshop on Algorithmically-Specialized Computer Organization. |
| 1983 | SIAM Fall Meeting. |
| 1983 | Calcul vectoriel et parallele, Paris, France. |
| 1983 | NATO Advanced Research Workshop on High-Speed Computations, Julich, Germany. |
| 1984 | Gatlinburg 9, Waterloo, Canada. |
| 1984 | IBM Europe Institute, Davos, Switzerland. |
| 1984 | VAPP II, Oxford, England. |
| 1985 | Vector and Parallel Processors for Scientific Computation, Rome, Italy. |
| 1985 | Second SIAM Conference on Parallel Processing for Scientific Computing. |
| 1986 | North Carolina State University. |
| 1986 | International Federation for Information Processing (IFIP) Working Group 2.5, Annual Meeting on Numerical Software, Argonne, IL. |
| 1986, | CONPAR 86, Conference on Algorithms and Hardware for Parallel Processing, Aachen, F. R. Germany. |
| 1986 | Massachusetts Institute of Technology, Workshop on Distributed Algorithms in Communication and Computation, Endicott House, M.I.T., October 22-24. |
| 1987 | IBM T. J. Watson Research Center, January. |
| 1987 | University of Maryland, Institute for Advanced Computer Studies. |
| 1987 | Workshop on Scientific Computing Using Parallel Architectures, April 6-8. |
| 1987 | 31st Annual International Technical Symposium on Optical & Optoelectronic Applied Science & Engineering (SPIE Proceedings vol. 826), Advanced Algorithms and Architectures for Signal Processing II, keynote address, August 18-19, San Diego, California. |
| 1987 | Nato Advanced Study Institute, The Application of Advanced Computing Concepts and Techniques in Control Engineering, September 14-25, IL-Ciocco, Tuscany, Italy. |
| 1987 | Minnesota Supercomputer Institute, University of Minnesota. |
| 1988 | Theoretical Physics Institute, University of Minnesota, Workshop on ``Massively Parallel Computing and Scientific Applications,'' May 3-7. |
| 1988 | SIAM Conference on Applied Linear Algebra, Madison, WI, May 23-26. |
| 1989 | Northern Illinois University, Conference on Applied Linear Algebra. |
| 1989 | International Conference on Supercomputing, Saint-Malo, France, July 4-8. |
| 1989 | Fourth Copper Mountain Conference on Multigrid Methods, Colorado, April 9-14. |
| 1989 | Conference on Preconditioned Conjugate Gradient Methods, Nijmegen, The Netherlands, June 19-21. |
| 1989 | International Symposium on the Mathematical Theory of Networks and Systems, Amsterdam, The Netherlands, June 19-23. |
| 1990 | Copper Mountain Conference on Iterative Methods, Copper Mountain, Colorado, April 1-5. |
| 1990 | CRPC@Caltech Forum, Pasadena, California, May 8-10. |
| 1990 | IBM Europe Inst. Workshop on Sparsity in Large Scientific Computations, Oberlech, Austria, August 4-11. |
| 1990 | Center for Computational Sciences, University of Kentucky, October 3. |
| 1990 | Symposium on Computational Technology for Flight Vehicles, Washington, DC, November 5-7. |
| 1990 | USC Fall Symposium on Supercomputing and Parallel Processing, December 6-8. |
| 1992 | Electricite de France, Summer School on Parallel Computing, June 29-July 10. |
| 1993 | Ohio State University, Scientific Computing, April 14. |
| 1993 | ICASE/LaRC Short Course on Parallel Computing, July 26-30. |
| 1994 | Athens University of Economics and Business, September 22-24. |
| 1995 | Kuwait University, March 13-15. |
| 1995 | International Conference on Scientific Computation and Differential Equations, (Honoring Bill Gear's 60-th Birthday), Stanford.. |
| 1995 | International Congress on Industrial and Applied Mathematics ( ICIAM 95), Hamburg, Germany, July 3-7. |
| 1995 | ETH, Zurich, Switzerland, July 11. |
| 1995 | SIAM National Meeting, October 23-26 |
| 1995 | International Conference on Computational Engineering Science. |
| 1998 | 4-th Japan-U.S. Symposium on Finite Element Methods in Large-Scale Computational Fluid Dynamics, Japan. |
| 1999 | 5-th U.S. National Congress on Computational Mechanics, Boulder, Colorado, August 4-6. |
| 2000 | 5-th U.S.-Japan Symposium on Flow Simulation and Modeling, Rice University, March 29-31. |
| 2000 | Finite Elements in Fluids 2000: Methods and Applications in Flow Simulation and Modeling, Austin, Texas, May 1-4. |
| 2000 | Workshop on Parallel Matrix Algorithms and Applications, Neuchatel, Switzerland, August 18-20. |
| 2001 | 3rd International Conference on Large-Scale Scientific Computations, Sozopol, Bulgaria, June 6-10. |
| 2001 | 6-th U.S. National Congress on Computational Mechanics, Dearborn, Michigan, August 1-4. |
| 2002 | 6-th Japan-U.S. International Symposium on Flow Simulation and Modeling, Kyushu University, Fukuoka, Japan, May 29-31. |
| 2002 | 5-th World Congress on Computational Mechanics, Vienna, Austria, July 7-12. |
| 2002 | 2nd International Workshop on Parallel Matrix Algorithms and Applications, Neuchatel, Switzerland, November 9-10. |
| 2003 | "Workshop on the Roadmap for the Revitalization of High-end Computing", National Coordinating Office for Information Technology Research and Development (NITRD), Washington D.C., June 16 - 18. |
| 2003 | "Advances in Flow Simulation and Modeling", in the 7th U.S. National Congress on Computational Mechanics, Albuqurque, New Mexico, July 27-31. |
| 2003 | "Numerical Methods in Computational Mechanics: Advances and Challenges",HERCMA-2003, Athens, Greece, September 25-27. |
| 2004 | "High Performance Computing: Parallelism in Numerical Linear Algebra", March 2-5. |
| 2004 | "4th European Congress on Computational Methods in Applied Sciences and Engineering",ECCOMAS 2004, Jyvaskyla, Finland, July 24-27. |