- Conference Chair, The Fifth International Conference on Boundary Element Technology, University of Delaware, Newark, Delaware, July 10-12, 1990, with C.A. Brebbia and S. Grilli.
- Conference Chair, The Third International Conference on Computer Methods and Water Resources, Beirut, Lebanon, September 25-28, 1995, with Y. Abousleiman, C.A. Brebbia, and D. Ouazar.
- Conference Co-Chair, The Fourth International Conference on Computer Methods and Water Resources, Byblos, Lebanon, June 16-18, 1997, with Y. Abousleiman and C.A. Brebbia (Conference Chairs), R. Ghanem and D. Ouazar (Co-Chairs).
- Conference Chair, The First International Conference on Water Resources Management, Halkidiki, Greece, September 24-26, 2001, with C.A. Brebbia, P. Anagnostopoulos, and K. Katsifarakis.
- Conference Co-Chair, The Third Biot Conference on Poromechanics, May 24-27, 2005, University of Oklahoma, with Y. Abousleiman (Conference Chair) and F. Ulm (Co-Chair).
- Conference Technical Co-Chair, Mid-South Area Engineering and Sciences Conference, May 17-18, 2007, Oxford, Mississippi, with K.-F. Lee (Conference Chair) and A. Elsherbeni (Technical Co-Chair).