- HPCC. IEEE International Conference on High Performance and Communications. Co-program Chair. Dalian, China, September 25-29, 2008.
- ICS-2007. Co-program Chair. IEEE-ACM International Conference on Supercomputing. Seattle, June 2007.
- ISCA-2006. IEEE-ACM International Symposium on Computer Architecture. Program Chair. Boston, May 2006.
- General Vice-chair. IEEE International Conference on Cluster Computing. Barcelona September, 25-28, 2006.
- International Vice-chair. IEEE INFOCOM. The IEEE Conference on Computer Communications. Barcelona, April 23-27, 2006.
- Micro-2005. The 38th. IEEE/ACM International Symposium on Microarchitecture. Program Chair. Barcelona, 12-16 November 2005.
- HiPEAC´05. International Conference on High Performance Embedded Architectures and Compilers. Program Chiar. Barcelona, November 17 to November 18, 2005.
- CF-2005. Program Chair. ACM Conference on Computing Frontiers. Ischia, Italy, April 2005.
- PACT-2004. Program Chair. IEEE International Conference on Parallel Architectures and Compilation Techniques. Antibes, France. October 11-15, 2004.
- Institutional Chair. HPCA-10. IEEE, International Symposium on High Performance Computer Architecture. Madrid, February 14-18, 2003.
- Plenary Chair. DSD-03 “Euromicro Workshop on Digital System Design”. Nevada, Las Vegas, Sept 2003.
- Awards Co-Chair. ICPP-2002. “International Conference on Parallel Processing”. Vancouver, Canada. August 18-21, 2002.
- ISHPC. “International Symposium on High Performance Computers”. Computer Architecture Vice-Program Chair. Nara, Japan. May, 15-17th, 2002.
- ICPP. “International Conference on Parallel Processing”. Program Chair. Valencia, Spain. Sept. 2001.
- EuroPar. Program Vice-chair for the Workshop “Parallel and Distributed Embedded Systems”. Manchester, Sept. 2001.
- HiPC-2000. International Conference for High-Performance Computing. Bangalore (India), Co-chair for the special invited session on “Future Processors”. Dec. 2000.
- EuroPar. Program Vice-chair for the Workshop “Parallel Computer Architecture”. Munich, Sept. 2000.
- ICPP. “International Conference on Parallel Processing”. Computer Architecture Program Vice-chair. Minneapolis, USA, August 2000.
- HiPC. “International Conference On High Performance Computing”. Program Chair. Bangalore, 17-20th Dec. 2000.
- PACT. IEEE – ACM “Parallel Architectures and Compilation Techniques”. European Publicity Chair. Philadelphia, USA, October 2000.
- ISHPC. “International Symposium on High Performance Computers”. Program Chair. Tokyo, Japan, October 2000.
- HiPC. “Int. Conference On High Performance Computing”, Program Vice-chair. Calcuta, Dec. 1999.
- EuroPar. Program Chair for the Instruction Level Parallelism Track. Toulouse, Sept. 1999.
- EuroPar. Program Chair for the Parallel Computer Architecture Track. Southampton, September 1998.
- EuroPar. Program Chair for the Automatic Parallelization and High Performance Computers Track. Lyon, 1996.
- PDP. “Euromicro Workshop on Parallel and Distributed Processing”. Program Chair. Sanremo, Italy, January 1994.