1) Member of the Greek Society of Greek Professionals on Computer Science (E.P.Y) (1985-08).
2) Member of the International User Group of DECUS (Digital Equipment Corporation User Society) (1987-08).
3) Representative of the Greek Parliament in the working group of the Research Centre of European Parliament for documentary systems in Parliaments (1984-87).
4) Member of the Technical Committee of the Greek Parliament selected to evaluate the tenders of an international Call for Tenders for the purchase of a Document Retrieval System.
5) Country delegate and representative of Digital Equipment Hellas in Information Management (OLTP) and CASE Competency Circles in Europe (1987-91).
6) Member of the Technical Committee for the acceptance of the new generation optical Metropolitan Area Network (MAN) of Greek Research Network (GRNET-2), based on Dense Wavelength Division Multiplexing (DWDM) technology (2001-2).
7) Member of the Network Technical Committee of TEI of Athens (1999-08).
8 ) Member of the Tele-training Technical Committee of TEI of Athens (2004-08).
9) Member and president of technical committees (about 50) for Call of Tenders, and evaluation of tenders for Equipment purchases and Personnel hiring in TEI of Athens (1997-09).
10) Session Chairman at the 26th IASTED International Conference on Artificial Intelligence and Applications, Genetic Algorithms session, AIA 2008, February 2008, Innsbruck, Austria.
11) Member of the Organizing Committee of “International Conference on Computer Graphics and Artificial Intelligence”, 2007-2011, Athens, Greece.
12) Reviewer of International Conference with referees: 13th ACM International Symposium on Mobility Management and Wireless Access (2015).