Dr. George Papastefanatos is a principal researcher (Grade B) since 2021 at the Information Management Systems Institute (IMSI) of the Athena Research Center. George obtained his Diploma on Electrical and Computer Engineering and his PhD in Computer Science from the Department of Electrical and Computer Engineering of the National Technical University of Athens (NTUA). Since 2009, George has worked as a senior researcher in several EU and national research projects in Athena R.C., NTUA, University of Athens, and University of Ioannina. He has also worked as an external IT expert in various private and public organizations in the design and implementation of large-scale IT projects. He has been an adjunct\visiting lecturer in University of Peloponnese, Athens University of Economics and Business, University of Aegean, University of Piraeus and National School of Public Administration. George has coedited 1 book, 3 chapters in books and more than 60 publications in international conferences and journals in the areas of big data management and analytics and specifically in issues related to data modelling, indexing and query optimization, data integration, data visualization and visual analytics. Three of his articles have been selected as Best Papers in International conferences. He has been involved in the implementation of more than 15 R&D projects either as senior researcher or scientific coordinator. In 2018, George was one of the receivers of ELIDEK grant for postdoc research on mathematics and computer science.