Professional Activities

• Journal of Web Semantics: Science, Services and Agents on the World Wide Web (JWS)

• ACM Transactions on Intelligent Interactive Systems (TIIS)
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• ACM Transactions on Internet Technology> (TOIT)
• Informatik Spektrum by Springer (http://www.springer.com/computer/journal/287)
• International Journal on Semantic Web and Information Systems (IJSWIS, also http://www.ijswis.org/)
• Journal of the Association for Information Systems (JAIS)
• Journal of Web Semantics: Science, Services and Agents on the World Wide Web (JWS)

• Swiss Informatics Society (SI)
• Swiss Informatics Reserach Association (SIRA)

General Chair

• IEEE European Conference on Web Services (ECOWS), 2006
• Wirtschaftsinformatik, 2011

Program Chair / Program Co-Chair (major conferences)

• IEEE European Conference on Web Services (ECOWS), 2006
• International Semantic Web Conference (ISWC), 2009
• Wirtschaftsinformatik, 2011

Program Vice Chair

• International Semantic Web Conference (ISWC), 2006
• International Semantic Web Conference (ISWC), 2007
• International Semantic Web Conference (ISCW), 2008

Programm Track Chair

• WWW Semantic Web Track, 2011
• RDBS Track; International Semantic Web Conference (ISCW), 2014

Program Chair / Program Co-Chair (workshops)

• CSCW’98 Workshop ”Towards Adaptive Workflow Systems”
• CSCW’2000 Workshop ”Beyond Workflow Management: Supporting Dynamic Organizational Processes”
• ISWC’05 Workshop on Semantic Web End User Interaction (SWUI’05)
• ISWC’06 Workshop on Semantic Web User Interaction (SWUI’06)
• Workshop on Semantic Web User Interaction (SWUI’07) at the University of Zurich  
• ECML/PKDD’07 Workshop on Planing to Learn (PlanLearn’07)
• CHI’08 Workshop on Semantic Web User Interaction (SWUI’08)
• ICML/COLT’08 Workshop on Planing to Learn (PlanLearn’08)