Xu Chen is currently a research fellow at University College London, UK, under the supervision of Prof. Jun Wang. He has obtained his PhD degree from Tsinghua University, China, on July 2019. In the period from March to September of 2017, he was studying at Georgia Institute of Technology, USA, as a visiting scholar, supervised by Prof. Hongyuan Zha. His research aims to build explainable algorithms to understand human intellectual activities and decision making processes, especially under dynamic, heterogeneous and interactive environments. With this motivation, he is now focusing on the fields of reinforcement learning, explainable recommender system and time series analysis.