• Associate Editor, VLDB Journal, 2013-present.
  • Program Committee member, 44th ACM SIGMOD, 2018.
  • Program Committe Chair, 26th ACM CIKM, 2017.
  • Program Committe member, IEEE Big Data, 2017.
  • PC Area Chair, The 2016 IEEE International Conference on Data Mining (ICDM), Barcelona (Catalonia, Spain), Dec 12-15, 2016.
  • Program committee member, The 22nd ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2016.
  • Program committee member, The 21st ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2015.
  • PC Area Chair, The 14th IEEE International Conference on Data Mining (ICDM), Shengzhen, China, Dec 14-17, 2014.
  • Program committee member, The 20th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2014.
  • Program Committee member, 23rd Int. World Wide Web Conference (WWW), 7-11 April, Seoul, Korea, 2014.
  • Demo Co-Chair, The 19th International Conference on Database Systems for Advanced Applications (DASFAA), 21-24 April, Bali, Indonesia, 2014.
  • Program committee member, 40th International Conference on Very Large Data Bases (VLDB)(PVLDB), 2013-2014.
  • Program committee member, First VLDB Workshop on Databases and Crowdsourcing, DBCrowd, Riva de Garda, Trento, August 26, 2013.
  • Program committee member, The 13th IEEE International Conference on Data Mining (ICDM) Dallas, Texa, USA, 2013.
  • Program committee member, 32nd International Conference on Conceptual Modeling (ER), Hong Kong, 2013.
  • Program committee member, The 19th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), Chicago, USA, 2013.
  • Demo Program Committee member, 39th ACM SIGMOD, New York, 2013.
  • Research Track Associate Editor, 39th International Conference on Very Large Data Bases (VLDB)(PVLDB), 2012-2013.
  • PC Vice Chair, Program Committee member, The 12th IEEE International Conference on Data Mining (ICDM), Brussels, Belgium, Dec 10-13, 2012.
  • Program committee member, The 18th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), Beijing, China, 2012.
  • Demo Program Committee member, 38th ACM SIGMOD, May 20-25, 2012.
  • Program Committee member, 37th ACM SIGMOD, June 12-16, 2011.
  • Program Committee member, 27th International Conference on Data Engineering (ICDE), Hannover, Germany, April 11-16 2011.
  • Program Committee member, 26th International Conference on Data Engineering (ICDE), Long Beach, California, USA, Mar 1-6, 2010.
  • Treasurer, The 18th ACM Conference on Information and Knowledge Management (CIKM), Hong Kong, Nov 2-6, 2009
  • Program Committee member, The IEEE International Conference on Data Mining (ICDM), Florida, USA, Dec 6-9, 2009.
  • Program committee member, The 15th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2009.
  • Program Committee member, The 14th International Conference on Database Systems for Advanced Applications (DASFAA), 2009.
  • PC member, 2009 Joint International Conferences on Asia-Pacific Web Conference (APWeb) and Web-Age Information Management (WAIM), 2009.
  • Area PC Vice Chair, 25rd International Conference on Data Engineering (ICDE), Shanghai, China, March 29 - April 4, 2009.
  • Program Committee member, The IEEE International Conference on Data Mining (ICDM), Pisa, Italy, Dec 15-19, 2008.
  • Program committee member, The 14th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), Las Vegas, August, 2008.
  • Program committee member, 12th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), Osaka, Japan, May 20-23, 2008.
  • Program committee member, 12th International Conference on Extending Database Technology, (EDBT), Nantes, France, March 25-29, 2008.
  • Program Committee member, 24rd International Conference on Data Engineering (ICDE), 2008.
  • Program Committee member, The Fifth IEEE International Conference on Data Mining (ICDM), 2007.
  • Program committee member, 9th International Conference on Data Warehousing and Knowledge Discovery (Dawak), 2007.
  • Program committee member, 11th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), 2007.
  • Program Committee member, 33rd International Conference on VLDB (VLDB), 2007.
  • Program Committee member, 23rd International Conference on Data Engineering (ICDE), 2007.
  • PC member, 1st Workshop on Spatial and Spatio-temporal Data Mining (SSTDM) 2006
  • Program Committee member, The Fifth IEEE International Conference on Data Mining (ICDM), 2006.
  • Program Committee member, The Seventh International Conference on Web-Age Information Management, (WAIM),2006.
  • Program committee member, The 12th ACM International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2006.
  • PC member, 10th International Conference on Extending Database Technology, (EDBT), 2006.
  • Program committee member, 10th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), 2006.
  • Program Committee member, The 11th International Conference on Database Systems for Advanced Applications (DASFAA 2006)
  • Program Committee member, The Fourth IEEE International Conference on Data Mining (ICDM), 2005.
  • Member of the International Program Committee, The IASTED International Conference on DATABASES AND APPLICATIONS DBA 2005.
  • Associate Editor, the International Journal of Data Warehousing and Mining (IJDWM), Idea Group Publishing.
  • Invited talk on data mining in "Experience Sharing on CRM Application", organized by Information Technology Services Department, Cyberport, 11 June 2004.
  • Adjunct Research Fellow, E-Business Technology Institute, The University of Hong Kong, 2004-2007.
  • Member of the Program Committee, The Fourth IEEE International Conference on Data Mining (ICDM), 2004.
  • Member of the Program Committee, 20th International Conference on Data Engineering (ICDE), 2004.
  • Member of the Program Committee, The Twenty-first International Conference on Machine Learning, ICML, 2004.
  • Member of the Program Committee, The Third IEEE International Conference on Data Mining (ICDM), 2003.
  • Member of the Program Committee, The Twentieth International Conference on Machine Learning, ICML, 2003
  • Finance Chair, Session chair-person, the 2nd International Workshop on Cooperative Internet Computing, 2002.
  • Program committee member, Treasurer, Session chair-person (Research), the 28th International Conference of Very Large Data Bases, (VLDB), 2002.
  • Program committee member, IEEE International Conference on Data Mining (ICDM), 2002.
  • Program committee member, The Eighth ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (SIGKDD), 2002.
  • Program committee member, 6th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), 2002.
  • Member of International Program Committee for the IASTED International Symposium on "Databases and Applications", 2002.
  • Member of the IASTED Technical Committee on "Database", 2001-2004.
  • PC member, Organizing committe member, treasurer, Session chair-person, 5th Pacific-Asia Conference on Knowledge Discovery and Data Mining (PAKDD), 2001.
  • PC member, Organizing committe member, registration chair, International Conference on Database Systems for Advanced Applications, (DASFAA) 2001.
  • Poster committee member, 10th Int. World Wide Web Conference, (WWW10), May 1-5, 2001.
  • Program committee member, the International Conference on Information Society in the 21 Century: Emerging Technologies and New Challenges (IS2000), 2000.
  • Speaker in "Leadership Traning Seminar (LTS) 2000" organized by Hong Kong Outstanding Students' Association, Seminar title: Data Mining, 11th November, 2000.
  • Honorary Consultant in Information Technology of Hon Chi Association, 2000, 2001.
  • Program committee member, International Conference on Web Information System Engineering (WISE), 2000.
  • Consultant for the data warehousing and data mining project of Sun Hung Kai Properties, 1999-2000.
  • Program committee member, the 5th International Computer Science Conference (ICSC '99), 1999.
  • Program committee member, 2nd International Symposium on Cooperative Databases Systems for Advanced Applications (CODAS), 1999.
  • Program committee member, 6th International Conference on Database Systems for Advanced Applications, (DASFAA), 1999.
  • Program committee member, Organizing committe member, secretary, the first international symposium on Intelligent Data Engineering and Learning, (IDEAL), 1998.
  • Program committee member, the 23rd International Conference of Very Large Data Bases, (VLDB), 1997.
  • Session chair-person in the 16th IEEE International Conference of Distributed Computer Systems (ICDCS), 1996.
  • Organizing committee member of the 1996 ACM Scholastic Programming Contest and Computer Chinese Checker Contest, Hong Kong.
  • Executive committe member, ACM-HK, 1995.