He has participated in more than 32 National, European and International programs, in 16 of which he has been involved as technical coordinator or principal researcher. He has more than 100 publications in chapters of books, international journals and conferences, and has 2 contributions in national legislation. He is a member of the editorial committee of more than 50 international journals and conferences, and has acted as editor in the publication of special issues of international journals, conference proceedings volumes and coedited three books. He is a senior member of IEEE, Assistant Editor In Chief (Special Issues) of IEEE IT Pro Magazine, member of the Technical Chamber of Greece, the European Association for Theoretical Computer Science, ACM, and counselor of the IEEE student department of Piraeus University of Applied Sciences.