I am a Professor of Artificial Intelligence in the Department of Information Studies at University College London (UCL), where I teach and do research on topics related to Artificial Intelligence, and co-director of the DIS Knowledge, Information and Data Science research group. I hold a Ph.D. and an M.Sc. in Computer Science from the University of Crete, a degree in Electrical and Computer Engineering from the Aristotle University of Thessaloniki, and a Professional Certificate in Learning and Teaching in Higher and Professional Education from the Institute of Education (University of London). My main research interests are in Knowledge Representation, Nonmonotonic Reasoning, Argumentation, Semantic Web and Multiagent Systems. I am also interested in the development of knowledge-based systems for the Web, intelligent environments, Cultural Heritage and other application domains.