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Editorial Board

• Member, Editorial Board, International Journal of Knowledge and Learning
• Member, Editorial Board, International Journal of Metadata, Semantics and Ontologies
• Special Guest, Editorial Board, International Journal for Infonomics
• Guest Editor, Special Issue on Digital Libraries in the Knowledge Era: Knowledge Management and Semantic Web Technology, Library Management Journal.
• Guest Editor, Special Issue on Semantic Web and HealthCare Systems Interoperability, International Journal of Semantic Web and Information Systems

Steering Committee

• International Workshop Series on Semantic Web and Databases, (typically) co-located with the Very Large Databases Conference (VLDB)

Conference and Workshop Organization

• Program Co-Chair, Eighth International Workshop on Cooperative Information Agents (CIA 2004)
• Program Co-Chair, International Conference on Semantics of a Networked World: Semantics for Grid Databases, sponsored by IFIP C2 Working Group on Databases in co-operation with 23rd ACM SIGMOD International Conference on Management of Data (SIGMOD 2004)
• Program Co-Chair, First International Workshop on Semantic Web and Databases in conjunction with the The 29th International Conference on Very Large Data Bases (VLDB 2003)
• Program Co-Chair, First International Workshop on Real World RDF and Semantic Web Applications in conjunction with the The 11th International WWW Conference

Professional Responsibilities

• Program Committee, 4^th International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems (ODBASE), 2005
• Program Committee, Contexts and Ontologies: Theory and Practice, AAAI 2005 Workshop
• Program Committee, 2005 International Conference on Information Quality (ICIQ 2005)
• Program Committee, Symposium on Knowledge Representation in Bioinformatics (KRBIO 2005)
• Program Committee, European Conference on Information Systems (ECIS 2005), Semantic Web and IS Track
• Program Committee, International Work Conference on Next Generation Web Services Practices (NGWSP'05)
• Program Committee, International Workshop on Data Mining and Bioinformatics, in conjunction with The International Conference on Computational Science and Applications (ICCSA 2005)
• Program Committee, The 1^st International Conference on Collaborative Computing (CollaborateCom 2005)
• Program Committee, The 2^nd European Semantic Web Conference, (ESWC 2005)
• Program Committee, The 15^th International Symposium on Methodologies for Intelligent Systems, (ISMIS 2005)
• Program Committee, The 20th ACM Symposium on Applied Computing, (SAC 2005), Web Technologies and Applications Track
• Program Committee, Mining for and from the Semantic Web, International Workshop located at the 10th International ACM SIGKDD Conference on Knowledge and Data Mining KDD 2004
• Program Committee, ECML/PKDD 2004 Workshop on Knowledge Discovery and Ontologies (KDO-2004)
• Program Committee, 2004 International Conference on Information Quality (ICIQ 2004)
• Program Committee, 2004 IEEE/WIC/ACM International Conference on Web Intelligence (WI 2004)
• Program Committee, International Workshop on Information Quality in Information Systems co-sponsored by 23rd ACM SIGMOD International Conference on Management of Data (SIGMOD 2004)
• Tutorial Chair, The 3rd International Semantic Web Conference, 2004
• Program Committee, Third International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems (ODBASE), 2004
• Program Committee, ECAI-2004 Workshop on Ontology Learning and Population in conjunction with the 16th European Conference on Artificial Intelligence 2004 (ECAI-2004)
• Program Committee, Workshop on Ontologies and their Applications in conjunction with XVII Brazilian Symposium on Artificial Intelligence (SBIA)
• Program Committee, Industrial and Demo Track, First European Semantic Web Symposium (ESWS), 2004
• Program Committee, 2004 IEEE International Conference on Web Services (ICWS 2004)
• Program Committee, Second International Workshop on Semantics in Peer-to-Peer and Grid Computing in conjunction with the Thirteenth International World Wide Web Conference (WWW 2004)
• Program Committee, The Eleventh International Conference on Artificial Intelligence: Methodology, Systems and Applications (AIMSA 2004)
• Program Committee, AI and the Web, Special Track at the 17th International FLAIRS Conference
• Program Committee, The 19th ACM Symposium on Applied Computing, (SAC 2004), Web Technologies and Applications Track
• Senior Program Committee, The 2nd International Semantic Web Conference, 2003
• Program Committee, First International Workshop on Practical and Scalable Semantic Systems colocated with ISWC 2003
• Program Committee, Semantic Integration Workshop colocated with ISWC 2003
• Program Committee, Workshop on Semantic Web Technologies for Searching and Retrieving Scientific Data colocated with ISWC 2003
• Program Committee, The 12th International WWW Conference, 2003, Semantic Web Track
• Program Committee, Second International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems (ODBASE), 2003
• Program Committee, Workshop on Semantics in Peer-to-Peer and Grid Computing in conjunction with the 12th International WWW Conference, 2003
• Program Committee, Workshop on Semantic Integration in conjunction with the The 2nd International Semantic Web Conference, 2003
• Program Committee, Semantic Web Technologies for Searching and Retrieving Scientific Data in conjunction with the The 2nd International Semantic Web Conference, 2003
• Review Panelist, NSF Division of Information and Intelligent Systems, 2003.
• Program Committee, The 18th ACM Symposium on Applied Computing, (SAC 2003), Web Technologies and Applications Track
• Program Committee, Workshop on Ontologies and Distributed Systems in conjunction with the 18th International Joint Conference on Artificial Intelligence (IJCAI) 2003
• Program Committee, The 11th Portuguese conference on Artificial Inteligence, 2003.
• Tutorial Chair, Federated Conference 2002 including Distributed Objects and Applications, Ontologies, Databases and Applications of Semantics and Cooperative Information Systems.
• Program Committee, First International Conference on Ontologies, Databases and Applications of Semantics for Large Scale Information Systems (ODBASE), 2002
• Program Committee, The 11th International WWW Conference, 2002, Semantic Web Track
• Member, Launch Group, Agricultural Ontology Server (AOS) Project initiated by the Food and Agricultural Organization, Rome
• Facilitator, Working Track 2 on Integration, Interoperability and Composition at the Semantic Web Working Symposium, 2001
• Program Committee, Workshop on Applications of Ontologies and Problem Solving Methods in conjunction with the 14th International Conference on Artificial Intelligence (ECAI 2000)
• Program Committee, IEEE Advances in Digital Libraries (ADL 2000)
• Program Committee, 4th International Workshop on Cooperative Information Agents (CIA 2000)
• Program Committee, 15th International Conference on Data Engineering (ICDE 1999)
• Program Committee, Workshop on Ontologies and Problem-Solving Methods: Lessons Learned and Future Trends in conjunction with 16th International Joint Conference on Artificial Intelligence (IJCAI 1999)
• Program Committee, 2nd IFCIS International Conference on Cooperative Information Systems (CoopIS 1997)

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