Yannis Manolopoulos was born in Thessaloniki, Greece in 1957. He received his 5-year Diploma degree in Electrical Engineering and his Ph.D. degree in Computer Engineering from Aristotle University of Thessaloniki in 1981 and 1986 respectively. Currently he is Professor at the Department of Informatics of the same university. He has been with the Department of Computer Science of the University of Toronto, the Department of Computer Science of the University of Maryland at College Park and the Department of Computer Science of the University of Cyprus. He has (co-)authored over 140 papers in refereed scientific journals and conference proceedings. He has also (co-)authored several textbooks in Greek and two monographs on "Advanced Database Indexing" and "Advanced Signature Indexing for Multimedia and Web Applications" by Kluwer. He served as PC (co-)chair of the 8th National Computer Conference (2001), the 6th ADBIS Conference (2002), the 5th WDAS Workshop (2003), the 8th SSTD Symposium (2003), the 1st Balkan Conference in Informatics (2003), and the 16th SSDBM Conference (2004). He is member of the Editorial Board of The Computer Journal and the International Journal of Data Warehousing and Mining. Also, he is Vice-chair of the Greek Computer Society and Chair of the Greek Section of ACM SIGKDD. His research interests include databases, data mining, data/file structures and algorithms, and performance evaluation of storage subsystems.

Alexandros Nanopoulos was born in Craiova, Romania, in 1974. Graduated from the Department of Informatcis, Aristotle University of Thessaloniki, Greece, on November 1996, and obtained a PhD from the same institute, on February 2003. The subject of his dissertation was: "Techniques for Non Relational Data Mining". He is co-author of more than 25 articles in international journals and conferences, also co-author of the monograph "Advanced Signature Techniques for Multimedia and Web Applications". His research interests include spatial and web mining, integration of data mining with DBMSs, and spatial database indexing.

Apostolos N. Papadopoulos was born in Eleftheroupolis, Greece in 1971. He received his 5-year Diploma degree in Computer Engineering and Informatics from the University of Patras and his Ph.D. degree from Aristotle University of Thessaloniki in 1994 and 2000 respectively. He has published several research papers in journals and proceedings of international conferences. From March 1998 to August 1998 he was a visitor researcher at INRIA research center in Rocquencourt, France, to perform research in benchmarking issues for spatial databases. His research interests include spatial and spatiotemporal databases, data stream processing, parallel and distributed databases, data mining, physical database design. His research work has over 170 citations in scientific journals and conference proceedings. He has served as a track co-chair of ACM SAC DTTA (Database Technologies Techniques and Applications) Track 2005 and 2006. He is a member of the Greek Computer Society and the Technical Chamber of Greece. Currently, he is a Lecturer in the Department of Informatics of Aristotle University of Thessaloniki.