He has participated is several boards, including the editorial board of ACM Computing Surveys (2016-19) and the Endowment of the Symposium on Spatial and Temporal Databases – SSTD (2010-). He has also served as general co-chair for SSTD’03 and ECML/PKDD’11, PC vice-chair for IEEE ICDM’08, and PC member for several conferences, including ACM SIGMOD/PODS, IEEE ICDE, ACM SIGKDD, IEEE ICDM, etc. Since 2001, he has been a (co-) principal investigator in several research projects funded by various government agencies (EU, Greece) through open calls. His research interests include Data Science (big data management & analytics) for humans’ mobility-related information. He has co-authored three monographs and over 100 refereed articles in scientific journals and conferences, with over 11,000 citations (h=49), according to Google Scholar.