Karl Aberer is a full professor for Distributed Information Systems at EPFL Lausanne, Switzerland, since 2000. Since 2005 he is the director of the Swiss National Research Center for Mo[1]bile Information and Communication Systems (NCCR-MICS, www.mics.ch). Prior to his current position, he was senior re[1]searcher at the Integrated Publication and Information Systems institute (IPSI) of GMD in Germany. He received his Ph.D. in mathematics in 1991 from the ETH Zürich. His research interests are on semantics and self-organization in information systems with applications in peer-to-peer search, semantic web, trust management and mobile and sensor networks. He is or has been serving on the editorial boards of SIGMOD Record, VLDB Journal, ACM Transaction on Autonomous and Adaptive Systems and World Wide Web Journal and been co-chairing among others the ICDE, ISWC, MDM, ODBASE, P2P, VLDB and WISE conferences.

• Introduction.- Structured Peer-to-Peer Databases.- Peer-to-peer Data Integration.- Peer-to-peer Retrieval.- Semantic Overlay Networks.- Conclusion.

Karl Aberer is a full professor for Distributed Information Systems at EPFL Lausanne, Switzerland, since 2000. Since 2005 he is the director of the Swiss National Research Center for Mo[1]bile Information and Communication Systems (NCCR-MICS, www.mics.ch). Prior to his current position, he was senior re[1]searcher at the Integrated Publication and Information Systems institute (IPSI) of GMD in Germany. He received his Ph.D. in mathematics in 1991 from the ETH Zürich. His research interests are on semantics and self-organization in information systems with applications in peer-to-peer search, semantic web, trust management and mobile and sensor networks. He is or has been serving on the editorial boards of SIGMOD Record, VLDB Journal, ACM Transaction on Autonomous and Adaptive Systems and World Wide Web Journal and been co-chairing among others the ICDE, ISWC, MDM, ODBASE, P2P, VLDB and WISE conferences.

• Introduction.- Structured Peer-to-Peer Databases.- Peer-to-peer Data Integration.- Peer-to-peer Retrieval.- Semantic Overlay Networks.- Conclusion.

Karl Aberer is a full professor for Distributed Information Systems at EPFL Lausanne, Switzerland, since 2000. Since 2005 he is the director of the Swiss National Research Center for Mo[1]bile Information and Communication Systems (NCCR-MICS, www.mics.ch). Prior to his current position, he was senior re[1]searcher at the Integrated Publication and Information Systems institute (IPSI) of GMD in Germany. He received his Ph.D. in mathematics in 1991 from the ETH Zürich. His research interests are on semantics and self-organization in information systems with applications in peer-to-peer search, semantic web, trust management and mobile and sensor networks. He is or has been serving on the editorial boards of SIGMOD Record, VLDB Journal, ACM Transaction on Autonomous and Adaptive Systems and World Wide Web Journal and been co-chairing among others the ICDE, ISWC, MDM, ODBASE, P2P, VLDB and WISE conferences.

• Introduction.- Structured Peer-to-Peer Databases.- Peer-to-peer Data Integration.- Peer-to-peer Retrieval.- Semantic Overlay Networks.- Conclusion.