Dr. Dimitrios Pierrakos holds a Ph.D. on Computer Science from the University of Athens, Department of Informatics and Telecommunications. He works as a Research Assistant at the Institute of Informatics and Telecommunications. He received his B.Sc. in Physics from the University of Athens in 1994, and his M.Sc. degree in Information Technology from University College London in 1996. His research interests lie in the areas of user modelling, web mining and web personalization.