• Research Awards:
• Best paper finalist (one of three) with the paper "Fractal Characterization of Web Workloads," WWW 2002 Conference, Web-Engineering Track, Honolulu, Hawaii, May 7-11, 2002.
• 2001 A. A. Michelson award from the Computer Measurement Group. A lifetime achievement award given in recognition of "outstanding contributions to computer metrics." (Read the acceptance speech and the citation plaque.)
• Elected member of IFIP's Working Group 7.3 for contributions to performance evaluation, 1998.
• Elected Fellow of the Association for Computing Machinery (ACM) "in recognition of outstanding technical and professional achievements in the field of information technology," 1997.
• Best paper award for the paper "Performance Modeling of a Unix Communications Server", 1997 Computer Measurement Group Conference.
• Outstanding Paper Award for the paper "A Performance Oriented Design Methodology for Large-Scale Distributed Data Intensive Information Systems", 1995 IEEE International Conference on Engineering of Complex Computer Systems.
• Teaching Awards:
• Teaching Excellence Award, George Mason University, 2000.
• Outstanding Teaching Award, School of Information Technology and Engineering, George Mason University, 1999.
• Service Awards:
• Recognition of Service Award, Association for Computing Machinery, for contributions to ACM as the General Chair of the 2007 Federated Computing Research Conference, June 2007.
• Recognition of Service Award, Association for Computing Machinery, for contributions to ACM as the General Chair of ACM Conference on Electronic Commerce, June 2003.
• Outstanding Reviewer, IEEE Internet Computing, 2001.
• Recognition of Service Award, Association for Computing Machinery, for contributions to ACM as the program co-chair of WOSP'00 - Second International Workshop on Software and Performance, September 2000.
• Recognition of Service Award, Association for Computing Machinery, for contributions to ACM as the General Chair of ACM Sigmetrics Conference, May 1999.