2011

• European Conference on Machine Learning (ECML) and European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD), Programme co-chair, Athens, Greece,

• Nineteenth International World Wide Web Conference (WWW2010) , Raleigh, USA
• Third ACM International Conference on Web Search and Data Mining (WSDM) 2010, New York, USA
• EDBT 2010 (13th International Conference on Extending Database Technology,Lausanne, Switzerland,

• IEEE – International Conference on Data Mining 2009, Miami, USA
• IEEE - International Conference on Data Engineering, 2009, Shanghai, China
• WWW 2009 , Madrid, Spain
• WWW 2009 poster track , Madrid, Spain
• The 1st International Conference on Sensor Networks Applications, Experimentation and Logistics , 24-25 September 2009 - Athens, Greece
• ASONAM2009::The 2009 International Conference on Advances in Social Network Analysis and Mining , Athens, Greece
• 2nd Artificial Intelligence Techniques inSoftware Engineering Workshop, 22- 23 April 2009 , Thessaloniki, Greece
• International ACM conference on "Management ofEmergent Digital EcoSystems (MEDES'09) , Lyon, France

• International Congress on Pervasive Computing and Management, Delhi, India, December 2008
• Artificial Intelligence Techniques inSoftware Engineering Workshop, at the 18th European Conference on Artificial Intelligence, programme co-chair
• 19th European Conference on Machine Learning (ECML) and the 12th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD), area chair
• IEEE International Conference on Data Mining 2008, Pisa, Italy, PC vice-chair

• 1st Workshop on Large-Scale Distributed Systems for Information Retrieval (LSDS-IR), colocated with ACM SIGIR 2007
• The Fifth International Symposium on Parallel and Distributed Processing and Applications (ISPA07), Canada 2007
• 6th Hellenic Data Management Symposium , Athens, July 2007
• AAAI 2007: National Conference on Artificial Intelligence. Vancouver, British Columbia, Canada
• 18th European Conference on Machine Learning (ECML) and the 11th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD)
• "Data Mining and Knowledge Discovery" Stream in EURO XXII - 2007 European Conference on Operational Research Prague, Czech Republic, July 8-11, 2007
• 11th International Conference on User Modeling (UM 2007), 25 to 29 of June 2007, Corfu, Greece

• P2PIR 2006 Workshop on Information Retrieval in Peer-to-Peer Networks, Arlington, USA, November 11, 2006
• WISE 2006: The 7th International Conference on Web Information Systems Engineering, Wuhan, China, October 23-26,2006
• ACM/WIDM 2006, 8th ACM International Workshop on Web Information and Data Management (WIDM 2006)November 10, 2006, USA
• ECML-PKDD 2006 European Conference on Machine Learning - European Conference on Principles and Practice of Knowledge Discovery in Databases
• ACM/KDD 2006, The 12th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining
• Tenth East-European Conference on Advances in Databases and Information Systems, September 3-7, 2006, Thessaloniki, Hellas
• 2nd ADBIS Workshop on Data Mining and Knowledge Discovery6 September 2006 Thessaloniki, Greece
• Joint International Workshop on Adaptivity, Personalization and the Semantic Web, at the 17th ACM Hypertext╒06 conference, Odense, Denmark
• ACM-IEEE/MDM 2006, 6th International Conference on Mobile Data Management (MDM'05)
• ICEIS 2006 - 8th International Conference on Enterprise Information Systems , Paphos, Cyprus from 23 to 27, May 2006
• Special Track on Data Mining, The 21st ACM Symposium on Applied Computing 23-27 April 2006, Dijon, France

• International Workshop on Geographic Hypermedia, in conjunctionAnnual Meeting of the Association of American Geographers (AAG), April 5-9, 2005 in Denver, USA.
• ER -2005, 24rd International Conference on Conceptual Modeling (ER2004)
• ACM-IEEE/MDM 2005, 6th International Conference on Mobile Data Management (MDM'05)
• IEEE/ICDE 2005, 21st International Conference on Data Engineering (ICDE 2005) - Call for Demonstrations
• SSTD05 , 9th International Symposium on Spatial and Temporal Databases

• ACM-GIS'04 - The 10th ACM International Symposium on Advances in Geographic Information Systems, November 8-9, 2002
• ACM - DocEng 2004 - The ACM Symposium on Document Engineering,
• ER2004 - 23rd International Conference on Conceptual Modeling (ER2004)
• Hellenic Data Management Symposium HDMS - 2004
• PARMA 2004 - From Data to Patterns: Int''l Workshop on Pattern Representation and Management

• CICM 2003 - 12th International Conference on Information and Knowledge Management (CIKM'03)
• VLDB 2003 - The VLDB 2003 Conference, Berlin
• SSDBM 2003 - 15th International Conference on Scientific and Statistical Database Management
• ACM-MMDB 2003 Call for Papers, The First ACM International Workshop on Multimedia DatabasesNew Orleans, Louisiana, USA, November 7, 2003
• DocEng 2003 - The ACM Symposium on Document Engineering, Grenoble, France,November, 2003

• DocEng 2002 - The ACM Symposium on Document Engineering, Mc Lean, VA, November 8-9, 2002.
• HDMS 2002 - 1st Hellenic Data Managment Symposium, Athens, Hellas, July 18-19, 2002.
• ACM-GIS'02 - The 10th ACM International Symposium on Advances in Geographic Information Systems, November 8-9, 2002
• ISMIS '02 - XIII. International Symposium on Methodologies for Intelligent Systems, June 27-29 2002, Lyon, France.

• MMM2001 - The 8th International Conference on Multimedia Modeling 2001, Amsterdam, The Netherlands.
• Symposium on Document Engineering, Atlanta, Georgia, USA November 9-10, 2001, in cooperation with ACM SIGWEB.
• ICME2001 - IEEE International Conference on Multimedia and Expo, August 22-25, 2001, Waseda University Tokyo, Japan.
• International Workshop on Mining Spatial and Temporal Data in conjunction with the Fifth Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD-01), April 16-18, 2001, Kowloon, Hong Kong.