He has served as the thesis/dissertation advisor of over 20 M.A. and Ph.D. students. Dr. Liu is the author/co-author of nearly 70 articles, books, and edited volumes. He has been awarded over 20 research grants from various funding agencies, including the National Science Foundation (NSF) and the U.S. Environmental Protection Agency. The total funding received as a PI or Co-PI has exceeded $1.5 million. Professor Liu has served in a number of NSF advisory/review panels. His research interest includes spatial interaction modeling, crime analysis and simulation modeling, location analysis, spatial data mining, geographic visualization, and environmental modeling. Dr. Liu is a former President and Chair of Board of Directors of the International Association of the Chinese Professionals in GIS. He has co-chaired a number of international conferences on GIS