Dr. Guo has worked on a number of topics related to web search and data mining, including query representation and understanding, learning to rank, and text modeling. His current research is focused on representation learning and neural models for information retrieval and filtering. He has won the Best Paper Award in ACM CIKM (2011), Best Student Paper Award in ACM SIGIR (2012) and Best Full Paper Runner-up Award in ACM CIKM (2017).