He has received his degree from the Department of Informatics, University of Athens in 1990 and his PhD from the same department in 1995. During the period 1991-1995 he was receiving a scholarship from the Greek State Scholarship Foundation. His work includes research in systems software and analysis and design of software systems, and has published more than 130 relevant papers in international journals and conferences. He has also participated in more than 25 international and national projects, mainly involving information and software systems. His research interests include information systems, semantic web, real-time and dependable systems, service-oriented architectures as well as information presentation aspects.