In the prior he was a Postdoctoral Research Associate in the Colleage of Inforamtion and Computer Sciecne (CICS) at UMass Amherst, in cooperation with Distinghuished Professor and ACM Fellow W. Bruce Croft. He also worked as an Assistant Specialist in School of Engineering of UC Santa Cruz. He obtained his PhD degree from the Department of Computer Science, Tsinghua University. His research interest mainly focuses on Economic Web Intelligence, Machine Learning, Personalization Theories, and Sentiment Analysis. Over the past years, he has published high-quality research papers in top journals and conferences, including SIGIR, WWW, IJCAI, AAAI, WSDM, CIKM, etc. He has also served as PC Members in WWW, WSDM, CIKM, NAACL, etc.