Prof. Dennis Y.C. Leung received his PhD in 1988 from the Department of Mechanical Engineering at the University of Hong Kong. He had worked with the Hongkong Electric Co., Ltd. for five years heading the air pollution section of the company before joining the University of Hong Kong in 1993. Since then he is very active in conducting research in environmental and energy engineering. Professor Leung is now a full professor of the department specializing in environmental pollution control and renewable energy development. He has published more than 400 articles in this area including 200+ peer reviewed SCI journal papers with high impact factors. He was invited to publish more than 10 review articles in top journals. His h-index is 45 and total citations are more than 10000. He is one of the top 1% highly cited scientists in the world in energy field since 2010 (Essential Science Indicators) until now. Prof. Leung has delivered more than 30 keynote and invited speeches in many conferences as well as public lectures. He serves as a chief editor or editorial board member of many journals including Frontiers in Environmental Sciences, Applied Energy, Journal of Power & Energy, Sustainable Energy, just name a few. Prof. Leung received numerous awards including the Outstanding Earth Champion Hong Kong award in 2008 in recognizing his contributions in protecting the environment.