Chairs
- Track co-chair for "Services, Applications and Business" of the 24th Annual IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE PIMRC'13), 8-11 September, 2013, London, UK.
- Evaluation track co-chair of the 11th International SemanticWeb Conference (ISWC-2012), November 11-15, 2012, Boston, USA.
- General co-chair of the "Cyber Physical Society with SOA, BPM and Sensor Networks" track of the 21st International Conference on Collaboration Technologies and Infrastructures (WETICE-2012), Toulouse, France June 25-27, 2012.
- Program co-chair of the 12th International Conference on Web Information System Engineering (WISE 2011) , October 13-14, 2011, Sydney, Australia.
- Program co-chair of the 10th International Conference on Ontologies, DataBases, and Applications of Semantics (ODBASE 2011), Oct 16-21, 2011, Crete, Greece.
- Workshop chair of the 8th European Conference on Web Services (ECOWS'10) , December 1-3, 2010, Ayia Napa, Cyprus.
- Vice Program Chair of the "Pervasive Services and Data Management" track of the IEEE International Conference on Sensor Networks, Ubiqutous, and Trustworthy Computing (SUTC 2010) , June 7-9, 2010, Newport Beach, California, USA.
- Co-organizer of the Dagstuhl Seminar "Semantic Challenges in Sensor Networks", Jan 24-29, 2010 (Dagstuhl Seminar 10042).
- Program co-chair of the 1st International Workshop on User-generated Services (UGS2009) , co-located with the 7th International Joint Conference on Service Oriented Computing (ICSOC2009) , November 24, 2009, Stockholm, Sweden.
- Program co-chair of the 1st International Workshop on the Semantic Sensor Web (SemSensWeb 2009), June 1st, 2009, Heraklion, Crete, Greece. Collocated with the 6th European Semantic Web Conference (ESWC 2009).
- Program co-chair of the International Workshop on Integration of the Real World and the Future Internet (RWI2009), co-located with the 5th IEEE International Conference on Distributed Computing in Sensor Systems (DCOSS '09), Marina del Rey, California, June 7-10, 2009.
- General Chair of the 5th European Semantic Web Conference (ESWC-2008), 1-5 June 2008, Tenerife, Spain.
- Program co-chair of the International Workshop on Sensor Network Technologies for Information Explosion Era (SeNTIE2008), April 27, 2008, in conjunction with the International Conference on Mobile Data Management (MDM 2008), April 27-30, 2008 (Beijing, China).
- Program co-chair of the International Workshop on the Role of Services, Ontologies, and Context in Mobile Environments (RoSOC-M '08), April 27, 2008, Beijing, China, in conjunction with the 9th International Conference on Mobile Data Management (MDM'08).
- Tutorial chair of the International Conference on Electronic Commerce (ICEC'08), August 19-22, 2008, Innsbruck, Austria.
- Panel chair of the 8th International Conference on Web Information Systems Engineering (WISE'07), 3-6th December, 2007, Nancy, France.
- Program co-chair of the Seventh IEEE International Conference on Peer-to-Peer Computing, 2007, Galway, Ireland.
- Funding the Semantic Web: A cross-continental assessment and outlook, panel at the 5th International Semantic Web Conference (ISWC 2006), Nov 5-9, 2006, Athens, GA, USA.
- Program co-chair of the 4th International Workshop on Distributed and Mobile Collaboration (DMC 2006) at the 15th IEEE International Workshops on Enabling Technologies: Infrastructures for Collaborative Enterprises (WETICE-2006), June 26-28, University of Manchester, UK.
- Program co-chair of the International Workshop on Managing Context Information and Semantics in Mobile Environments (MCISME) in conjuction with the 7th International Conference on Mobile Data Management (MDM'06), Nara, Japan, May 9-12, 2006.
- Program co-chair of the International Workshop on Security and Trust in Decentralized/Distributed Data Structures (STD3S), in conjunction with the 22nd International Conference on Data Engineering (ICDE'06), April 3-7, 2006, Atlanta, GA, USA.
- Program co-chair of the 1st Workshop on Semantics in Mobile Environments (SME'05), May 9, 2005, Ayia Napa, Cyprus, in conjunction with the 6th International Conference on Mobile Data Management (MDM'05).
- Local organization chair of the 6th Workshop on Distributed Data and Structures (WDAS'2004), Lausanne, Switzerland, July 8-9, 2004.