I am an associate researcher at the Institute for the Management of Information Systems (IMIS) of the Research and Innovation Centre in Information, Communication and Knowledge Technologies "Athena". My main research interests lie in the areas of Privacy Preservation and Big Data management. I am also interested in the management of spatiotemporal data, query processing and indexing for containment queries. I am managing two related projects in IMIS: MEDA, which focuses on big data management and MoDiSSENSE, which deals with location based social networks. In the past I have been a post doc fellow at the Department of Computer Science of the The University of Hong Kong and I have taught courses related to data management for several years in the Masters Program of the Department of Computer Science and Technology in The University of Peloponnese and in the Geoinformatics Master's program of NTUA as an Adjunct Lecturer. I received my PhD in 2007 from the National Technical University of Athens, under the supervision of Prof. Timos Sellis.