Ying Long is now an associate professor in the School of Architecture, Tsinghua University, China. His research focuses on urban planning, quantitative urban studies and applied urban modeling. He has an education background in both environmental engineering and city planning. Before joining Tsinghua University, he has worked for Beijing Institute of City Planning as a senior planner for eleven years. Familiar with planning practices in China and versed in international literature, Dr. Long’s academic studies creatively integrate international methods and experiences with local planning practices. He has published over one hundred journal papers and led over twenty research/planning projects. Dr. Long is also the founder of Beijing City Lab (BCL www.beijingcitylab.com), an open research network for quantitative urban studies. Shuqi Gao is a lecturer in the School of Architecture at Southeast University in Nanjing, Jiangsu, China, specializing in the fields of shrinking cities,physical disorder, aging society and urban redevelopment. He graduated from the Tsinghua University with a doctoral degree on urban planning. From 2016 to 2017, he was a visiting doctoral student at Massachusetts Institute of Technology’s Department of Urban Studies and Planning, where he delved into the research of corresponding strategies for shrinking cities in the US. He has published several papers that related to the topic of shrinking cities on top planning journals in China. He has attended seminars on the issue of shrinking cities in various places, including University of Tokyo and Massachusetts Institute of Technology.