My research areas include information retrieval, natural language processing, text mining and machine learning. I have published more than 20 papers in top conferences such as WWW, SIGIR, ACL, CIKM, WSDM, ICDM and NAACL. Moreover, I have served as the PC member for top conferences including KDD, ACL, SIGIR, WWW, AAAI, EMNLP, WSDM and CIKM. I'm now focusing on research on deep learning, text matching, question answering, neural conversational models, search, ranking and relevance, learning to rank, statistical language models, probabilistic graphical models and user modeling/profiling.