Local Organizing Committee, 5th International Association for Fracture Mechanics of Concrete and Concrete Structures (Vail, Colorado), 2002-2005.
Organizer (with B. Jeremic), Symposium on Computational Geotechnics, 5th World Congress on Computational Mechanics, Vienna, Austria, July, 2002.
National Steering Committee, 15th ASCE Engineering Mechanics Conference, Columbia University, 2002; 14th ASCE Engineering Mechanics Conference, University of Texas, Austin, 2000.
Technical Activities Committee (TAC), American Society of Civil Engineers, 2001, 2004.
NSF Site Visit Team, Network for Earthquake Engineering Simulation (NEES), 2002.
Committee on Continuing Education, American Society of Civil Engineers, 2002 - 2005.
The Alfred Noble Prize committee (ASCE/IEEE/ASME/AIME), 2001-2002.
Organizing Committee, ASCE National Convention, Houston, 2001.
Co-Chair, Organizing Committee, 5th U.S. National Congress on Computational Mechanics, Boulder, Colorado, 1999.
Co-Chair, Organizing Committee, ASCE-GeoInstitute, “Geo-Denver 2000“, Denver, Colorado.
National Steering Committee, 13th ASCE Engineering Mechanics Conference, (Johns Hopkins University), 1999.
Advisory Committee, 10th International Conference on Computer Methods and Advances in Geomechanics, Tucson, Arizona, January, 2001.
Organizing Committee, International Workshop on the Physics and Mechanics of Soil Liquefaction, The Johns Hopkins University, Baltimore, Maryland, 1998.
National Steering Committee, 12th ASCE Engineering Mechanics Conference, (University of California, San Diego), 1998.
National Steering Committee, 11th ASCE Engineering Mechanics Conference, (Florida Atlantic University, Ft. Lauderdale, Florida), 1996.
External Reviewer, Program Review, Duke University, Department of Civil and Environmental Engineering, 1998.
Chair, Organizing Committee, ASCE 10th Engineering Mechanics Conference, Boulder, Colorado, 1995.
External Reviewer of Program, University of Oklahoma, School of Civil Engineering and Environmental Science, 1996.
ASCE Professional Activities Committee, Committee on Sections & District Councils, 1991-1996; Chair, 1995.
Advisory Committee, Society of Experimental Mechanics, International Conference on Nondestructive Testing of Concrete in the Infrastructure, 1993.