- 20th International World Wide Web Conference (WWW-2011), 2012.
- ACM International Conference on Management of Data (SIGMOD), 2012.
IEEE International Conference on Data Engineering (ICDE'12), 2012.
past activities: 1992-2010
IEEE Transactions on Knowledge and Data Engineering, Editor-in-Chief, 2009-2012
Distributed and Parallel Databases, Springer. Editor, 2008-.
IEEE Transactions on Knowledge and Data Engineering, Editor, 2003-2007
- VLDB Journal, Springer Verlag, Editor, 2002-2007
International Journal of Geographical Information Systems (Taylor&Francis).
Geoinformatica (Kluwer Academics). Editor, 1997--2005
- VLDB Endowment, Trustee board member. 2006-2013. Secretary: 2010-2013.
SIGMOD Jim Gray Best Thesis Award committee, co-Chair, 2008-2011.
(Committee member. 2005-2008)
Evaluator for promotion/new hire cases for
various Universities in Hongkong, Taiwan, US, Canada
Evaluator for Grant Proposals for various overseas funding agencies