Worked as teacher of Physics at the Pangyprian Gymnasium Nicosia (1957 – 59), Head of the Electrical Engineering Section of the Limassol Technical School (1962 – 63), Research Scientist at the Dimocritos National Research Centre, Athens (1963 – 75), Professor of Computer Science at the University of Athens (1975 - 2000), Professor Emeritus of the University of Athens (2000 – today).

Served as Vice – Rector of Economic Planning and Development of the University of Athens(1982 – 85, 1988 – 1994 and 1998 – 2000), Dean of the Faculty of Science of the University of Athens (1985 – 88), Head of the Department of Informatics  and Telecommunications of the University of Athens(1989 – 94, 1997 – 99).

Acted as Vice – chairman of the Preparatory and Interim Governing Board of the University of Cyprus, Vice - Chairman of the Governing Board of the University of Peloponnese (2001 – 2004), member of the Preparatory Committee of the Technological University of Cyprus (2002 – 2003), Vice – Chairman of the Open University of Cyprus (2003 – to-day).

Acted as Vice Chairman of the Governing Board of the “Onassis Cardiosurgical  Centre” and the “Atticon Hospital” and as Chairman of the Governing Board of the “Evgenidion University Hospital” (Athens). He also acted as advisor to the Governments of Greece and Cyprus on Data Processing.

Has published many articles in scientific journals and the proceedings of International Conferences on various subjects such as Computer Architecture, Computer Networks, Error Detection and Correction Codes, Parallel Computing, Natural Language Processing, Educational and Distance Learning Software, and has taught a variety of lessons in Computer Science and Engineering for the Undergraduate and Postgraduate students of the University of Athens.