• Program Committee Member, SIGIR 2007
• Program Committee Member, ICIP 2007
• Program Committee Member, WI 2007
• Program Committee Member, PAKDD 2007
• Program Committee Member, APWeb 2007
• Program Committee Member, WAIM 2007
• Program Committee Member, VISUAL 2007
• Co-chair, 1st Workshop on Learning to Rank for Information Retrieval, in conjunction with SIGIR 2007.
• Program Committee Member, Workshop on Working with Query Logs: Social and Technological Challenges, In conjunction with WWW 2007.
• Program Committee Member, TDMM Workshop, In conjunction with ICDE 2007
• Program Committee Member, DMBiz 2007, In conjunction with PAKDD 2007.

2006

• Program Committee Member for Posters and Demonstrations, SIGIR 2006
• Program Committee Member, WI 2006
• Program Committee Member, ICDM 2006
• Program Committee Member, AIRS 2006
• Program Committee Member, PRICAI 2006
• Program Committee Member, WAIM 2006
• Workshop Committee Member, ICSE 2006
• Session Chair, PAKDD 2006

Before 2006

• Session Chair, WI 2005
• Program Committee Member, ICIP 2005
• Program Committee Member, ICIP 2004

Journal Reviewer

• Reviewer, IEEE Transactions on Pattern Analysis and Machine Intelligence
• Reviewer, Foundations and Trends in Information Retrieval
• Reviewer, Journal of Machine Learning Research
• Reviewer, ACM Transactions on Information System
• Reviewer, ACM Multimedia System Journal
• Reviewer, Communications of the ACM
• Reviewer, IEEE Transactions on Knowledge and Data Engineering
• Reviewer, IEEE Transactions on Multimedia
• Reviewer, IEEE Transactions on Neural Network
• Reviewer, Journal of the American Society for Information Science and Technology
• Reviewer, Journal of Information Processing and Management
• Reviewer, Journal of Machine Vision and Application
• Reviewer, Pattern Recognition Letters
• Reviewer, Journal of Computer Science Technology

Invited Talks

• Learning to Rank, Invited talk at Tokyo Forum on Advanced NLP and Data Mining, University of Tokyo, 2008.
• Learning to Rank, Invited talk at Renmin University, China, 2008.
• Link Analysis and Anti Spam, Invited talk at Renmin University, China, 2008.
• Ranking in Information Retrieval, Invited talk at Tsinghua University, China, 2007
• Learning to Rank, Invited talk at Pao-Lu Hsu Statistics Conference: Machine Learning 2007.
• Learning to Rank for Information Retrieval, Invited talk at National Taiwan University, Taiwan, 2007.
• Link Analysis and Anti-Spam, Invited talk at Chinese Academy of Science, 2007.
• Link Analysis and Anti-Spam, Invited talk at Taiwan Tsing Hua University, 2007.
• Link Analysis and Anti-Spam, Invited talk at Shanghai Jiaotong University, China, 2007.
• Link Analysis and Anti-Spam, Invited talk at University of Science and Technologies of China, 2006.
• Heterogeneous Object Clustering, Invited talk at Nanyang Technology University, Singapore, 2006.
• Relevance Propagation for Web Search, Invited talk at DCWC 2006.
• SVM and Its Application to Text Classification, Invited talk at Microsoft Research Advanced Technology Center, 2006.
• Career development in research communities, Invited talk at student winedown of Microsoft Research Asia, 2006.
• Heterogeneous High-Order Data Mining, Invited talk at The Workshop on Machine Learning and Its Application, 2006.
• How to be an Excellent Graduate Student, Invited talk at Tsinghua University, Beijing China, 2005.