Matthias Hemmje is full professor at the FernUniversität in Hagen, one of the leading distance universities in Germany. He is involved in research on Virtual Information and Knowledge Environments with special focus on distributed collaborative Digital Libraries, Multimedia Archives, Information Retrieval, Filtering, Linking, Enrichment, Personalization, and Information Visualization. He is building on research expertise from a long standing history in national and European projects. His R&D expertise includes information retrieval, multimedia databases, virtual environments, information visualization, human computer interaction, and multimedia. He has also guided research in the area of content engineering, knowledge technologies, peer-to-peer based systems, collaboration and e-learning support systems as well as mobile and location based services.