- 2007: Professor at the department of Informatics and Telecommunications of the National and Kapodistrian University of Athens (NKUA)
- 1994: Associate Professor at the department of Informatics and Telecommunications - NKUA
- 1989: Assistant Professor at the department of Informatics and Telecommunications - NKUA
- 1986: Assistant Professor at the department of Physics - NKUA
- 1982: Lecturer at the department of Physics - NKUA
- 1978: Research Fellow of Electronics at the department of Physics - NKUA
- Chairman of the department of Informatics and Telecommunications (2010-present)
- Chairman of monitor Committee for the Operational Programme “Information Society” (from 26/11/02 to 15/03/04)
- Secretary General of Public Administration and Electronic Government of the Ministry of Interior (from 26/11/02 to 15/03/04).
- Secretary General of Information Systems of the Ministry of Finance (from 20/04/97 to 15/01/02).
- Director of the B’ Sector (Information Systems and Applications) of the department of Informatics and Telecommunications – NKUA (1992-1996)
- Senate member of National and Kapodistrian University of Athens (1992-1994)
