2006 Program Chair of the 15^th Heterogeneous Computing Workshop (HCW 2006), Rhodes Island, Greece, April 25, 2006.

Co-General Chair, 7th Annual International Conference on Digital Government Research, San Diego, California, May 21-24, 2006.

Co-General Chair, 5th International Conference on Grid and Cooperative Computing (GCC 2006)

General Chair, 1^st Workshop on Virtualization Technologies in Distributed Computing, held jointly with Supercomputing’06, Tampa, Nov. 17, 2006.

2007 General Chair of the 16th Heterogeneous Computing Workshop (HCW 2007), Long Beach, CA, March 2007.

Co- Program Chair of the 4^th International Conference on Autonomic Computing (ICAC07), Jacksonville, FL, June 11-15, 2007.

General Chair, 2nd Workshop on Virtualization Technologies in Distributed Computing, held jointly with Supercomputing’07, Reno, Nov. 12, 2007.

2008 Co- General Chair of the 5^th International Conference on Autonomic Computing (ICAC07), Chicago, Ill., June 2-6, 2008.