Other Service as Chair, Organizer, Adviser or Similar
- Member, best paper award committee, Thirtyeighth International Conference on Very Large Databases, Istanbul, Turkey, September 2012.
- Member, steering committee, Third International Workshop on Graph Data Management: Techniques and Applications, Berlin, Germany, March 2012.
- Member, international advisory board, Ninth International Conference on Flexible Query Answering Systems, Ghent, Belgium, October 2011.
- Chair, workshops, 2011 ACM SIGMOD International Conference on the Management of Data, Athens, Greece, June 2011.
- Member, best paper award committee, Thirtysixth International Conference on Very Large Databases, Singapore, September 2010.
- Co-chair, Publicity, Thirtysixth International Conference on Very Large Databases, Singapore, September 2010.
- Chair, Workshops, 2010 ACM SIGMOD International Conference on the Management of Data, Indianapolis, IN, USA, June 2010.
- Workshops co-chair, Twentysixth IEEE International Conference on Data Engineering, Los Angeles, CA, USA, April 2010.
- Member, international advisory board, Eighth International Conference on Flexible Query Answering Systems, Roskilde, Denmark, October 2009.
- Member, steering committee, International Workshop on Data Management for Sensor Networks, August 2009 to present.
- VLDB Endowment liaison, Thirtyfifth International Conference on Very Large Databases, Lyon, France, August 2009.
- Member, influential paper award committee, IEEE International Conference on Data Engineering, October 2007–September 2010.
- Member, Best Paper Award Committee, Thirtysecond International Conference on Very Large Data Bases, Seoul, South Korea, September 2006. (Recipient of a VLDB Endowment Certificate of Appreciation for this service.)
- Member, advisory committee, Third International Workshop on Spatio-Temporal Database Management, Seoul, South Korea, September 2006.
- Member, steering committee, International ACM Workshop on Data Engineering for Wireless and Mobile Access, June 2006 to present.
- Member, international advisory board, Seventh International Conference on Flexible Query Answering Systems, Milan, Italy, June 2006.
- Chair, special sessions, 2006 ACMSIGMOD International Conference on the Management of Data, Chicago, Illinois, June 2006.
- Member, advisory committee, Second International Workshop on Spatio-Temporal Database Management, Toronto, Canada, August 2004.
- Panels chair, 2004 ACM SIGMOD International Conference on the Management of Data, Paris, France, June 2004.
- Panel organizer, "Managing location information for billions of gizmos on the move—what's in it for the database folks?," with Ouri Wolfson, Seventeenth International Conference on Data Engineering, Heidelberg, Germany, April 2001.
- Member, steering committee, International Symposium on Spatial and Temporal Databases, July 2001–July 2007.
- European Coordinator, 2000 ACM SIGMOD International Conference on the Management of Data, Dallas, TX, May 2000.
- Member, best paper and student paper awards committee, Fourteenth IEEE International Conference on Data Engineering, Orlando, FL, April 1998 (with Umesh Dayal and Andreas Reuter).
- Member, scientific committee, Dagstuhl Seminar on Temporal Databases, Schloss Dagstuhl, Germany, June 1997.
- Tutorial chair, 1997 ACM SIGMOD International Conference on the Management of Data, Tucson, AZ, May 1997.