Conferences
-  International Conference on Very Large Data Bases (VLDB), 2022.
AE.
 -  International Conference on Very Large Data Bases (VLDB), 2021.
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2021.
AE.
 -  EDBT, ToT paper selection committee. 2021.
 -  ACM Symposium on Cloud Computing (SoCC), 2020. PC Chair.
 -  International Conference on Very Large Data Bases (VLDB), 2020.
PC member. Best Paper award selection committee.
 -  International Conference on Very Large Data Bases (VLDB), 2019.
Industry Track PC Chair.
 -  IEEE International Conference on Data Engineering (ICDE'18), 2018.
PC Chair.
 -  ACM International Conference on Management of Data (SIGMOD), 2018.
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2017.
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2016.
PC member.
 -  IEEE International Conference on Data Engineering (ICDE'15), 2015. 
PC member.
 -   22nd International World Wide Web Conference (WWW-2014), 2014.
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2014.
PC member.
 -  IEEE International Conference on Data Engineering (ICDE'14), 2014. 
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2013.
Tutorial selection committee.
 -  IEEE International Conference on Data Engineering (ICDE'13), 2013. 
Conference Chair.
 -   21st International World Wide Web Conference (WWW-2013), 2013.
PC member.
 -   20th International World Wide Web Conference (WWW-2012), 2012.
PC member.
 -  ACM International Conference on Management of Data (SIGMOD), 2012.
PC member.
 - 
IEEE International Conference on Data Engineering (ICDE'12), 2012. 
PC Chair.
 - 
 past activities: 1992-2010 
 
Journals
- 
ACM/IMS Transactions on Data Science (TDS). Founding Editor-in-Chief, 2018-.
 - 
ACM Communications of ACM (CACM). Editor. 2015 -
 - 
IEEE Transactions on Cloud Computing. Editor. 2013-2019.
 - 
Elsevier Journal of Big Data Research (JBDR). Founding co-Editor-in-Chief, 2014-2016.
 - 
IEEE Transactions on Knowledge and Data Engineering (TKDE). 
Editor-in-Chief, 2009-2012
 - 
Springer Distributed and Parallel Databases. Editor, 2008-2013.
 - 
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).
Editor, 1995-2005
 
- 
Geoinformatica (Kluwer Academics). Editor, 1997--2005 
 
Trustee
-  VLDB Endowment, Trustee board member. 2006-2017. Secretary: 2010-2013.
President: 2014-2017.
 
Others
- 
Dagsthul Seminar on
Distributed Computing with Permissioned Blockchains and Databases.
Co-organizer. 2019.
 - 
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 China, Hongkong, Taiwan, US, France, Canada.
 - 
Evaluator for Grant Proposals for various overseas funding agencies.
 
Notes: years may have been entered wrongly unintentionally -- this only serves as general information.