Michail Vaitis holds a Diploma (1992) and a Ph.D. (2001) in Computer Engineering and Informatics from the University of Patras, Greece. He was collaborating for five years with the Computer Technology Institute (CTI), Greece, as a research and development engineer, working on hypertext and database systems. Now he is an assistant professor at the Department of Geography, University of the Aegean, Greece, which he joined in 2003. His research interests include geographical databases, spatial data infrastructures, and hypermedia models and services.