Dr. Jingzheng Ren is currently an assistant professor at The Hong Kong Polytechnic University. He is also an adjunct associate professor at the University of Southern Denmark and the associated senior research fellow of the Institute for Security & Development Policy. He worked as an associate professor at the University of Southern Denmark before moving to The Hong Kong Polytechnic University. He has published more than 200 publications including 160 journal papers, 1 authored book, more than 10 books, and more than 40 book chapters.  

Overview of Footprint Family for Environmental Management of Energy and Industrial Systems.- Definitions, Concepts, Evolution and Applications of Footprints: Past, Current and Future.- Three-Dimensional Ecological Footprint for Sustainability Assessment of Energy and Industrial Systems.-Measurement of Carbon Footprint in Different Scales: Methods and Case Studies.- Methodological Framework for Water Footprint Calculation of Energy and Industrial Systems under Uncertainties.-Nitrogen Footprint and Nitrogen Utilization Efficiency in Energy and Industrial Systems.- Coupling Input-Output model and Energy Footprint: A Genetic Framework and Applications in Energy and Industrial Systems.- Developing A Life Cycle Composite Footprint Index for Sustainability Prioritization of Energy and Industrial Systems.- Outlook of Footprint Family.