Demetrios Sarantis is Postdoctoral Fellow at UNU-EGOV. Demetrios graduated in Electrical and Computer Engineering by the National Technical University of Athens, holds a MSc in Operational Research and Information Systems from the London School of Economics and Political Science, and a PhD in e-Government from the National Technical University of Athens. He has been employed in software industry and in the Hellenic Telecommunications and Post Commission (EETT), deploying and managing information systems and services and supporting database information infrastructures. He has also worked as researcher in e-Government Unit in Decision Systems Laboratory of School of Electrical and Computer Engineering at the National Technical University of Athens (NTUA), participating in national and international research projects, in the areas of Government Transformation, Interoperability Frameworks, eParticipation, eGovernment, Process Modelling and Re-engineering in Public Sector. He has worked as researcher in Yale University (USA) in the area of Ontology Data Modelling in Biomedicine. His current research interests are Data Modelling-Ontologies, e-Governance. Public Administration, Information Systems Interoperability and Smart Cities.