Costas Christidis holds a Diploma (2007) from the School of Electrical and Computer Engineering of the National Technical University of Athens (Greece). His Diploma Thesis was in the area of Web Services and Mobile Communications. He has also worked as an Administrator in the Computer Center of the School of Electrical and Computer Engineering. He is currently a research engineer at the Information Management Unit. His current research interests include ontology-based modelling, web services and incorporating semantics to the personal desktop and to collaborative workspaces.