His teaching and research interests are focused on resource allocation protocols and traffic management
for communication networks. His past research has been published in over 100 scientific journals and
conference proceedings. His research has been funded by NSF, DARPA, GTE, BBN and Motorola (USA) as
well as Greek and European Union Funding agencies. He has served repeatedly in NSF research proposal
review panels and involved in the organization of numerous conferences sponsored by IEEE,
ACM, ITC and IFIP societies.
He is a senior member of IEEE, a member of the IEEE Technical Committee on Computer Communications
(TCCC) and a member of IFIP WG6.3. He has served as an elected officer for TCCC, as a co-organizer
of the 1996 International Teletraffic Congress (ITC) Mini-Seminar, on ``Performance Modeling and
Design of Wireless/PCS Networks, as the organizer of the 1999 IFIP WG6.3 workshop, a technical
program co-chair for the IFIP Networking'2000 conference and general vice-chair for the IFIP
Networking'2002 conference. He is an associate editor of the ACM/Kluwer Wireless Networks Journal,
the Computer Networks Journal and the IEEE/ACM Transactions on Networking.