I am Professor of GIScience at the Institute of Remote Sensing and Geographical Information Systems, Peking University. My research interests cover several theoretical aspects in geographical information science (e.g. spatial cognition and spatial reasoning) and human mobility patterns. He has conducted about 10 research projects as PI or Co-PI granted by NSFC (National Science Foundation of China) and MOST (Ministry of Science and Technology) of China. I have published more than 50 refereed papers in international journals including International Journal of Geographical Information Science, Transactions in GIS, and Computers and Geosciences.