Patrick X.W. Zou is Chang'an Scholar Distinguished Professor at Chang'an University, Xi'an, China. He obtained his PhD from the University of New South Wales (UNSW), Australia, and taught and conducted research at several Universities in Australia for more than 20 years. He has also held visiting appointments at several universities. His research, teaching and consultancy is focused on research methodologies, safety management, risk management and energy saving of critical infrastructure engineering. He has won more than 10 awards for excellence in research, teaching and service.Xiaoxiao Xu is an Associate Professor in the School of Civil Engineering at Nanjing Forestry University, Nanjing, China. His research interests include complex system modeling and simulation, building energy, and risk management.