Dr. Wallace Woon-Fong Leung is a Distinguished Research Professor from Hong Kong Polytechnic University. He was formerly Chair Professor of Innovative Products and Technologies (2005-2020) and founder and Director of Research Institute of Innovative Products and Technologies (2005-2011) in the same University. He has worked in filtration and separation for 45 years both in industry in the US and academia in Hong Kong from membrane filtration, sedimentation, vacuum filter, centrifugation, air filtration, and photocatalytic oxidation. He has 52 US patents, single-authored 3 books, several handbook chapters, and over 80 SCI papers. He has trained many engineers and graduated 9 PhD students. He is a fellow respectively of AICHE, ASME, AFS, HKIE, and Hong Kong Academy of Engineering Sciences. He is the Chairman of International Delegation on Filtration, 2016 – 2022, with 13 member countries worldwide and Chairman of the 9th and 13th World Filtration Congress in 2004 and 2022, respectively. He received his BSc from Cornell, and both SMME and ScD from MIT. In 2015, he has received the Frank Tiller Award for his lifetime contribution in engineering and education on filtration and separation technologies by the American Filtration and Separations Society.Dr. Leung is also a multidisciplinary engineer, scientist, and educator with international academic and industrial experiences. During the COVID-19 pandemic, he has deployed his invented nanofiber technologies in mass production of highly protective, highly breathable facemasks for the public railroad.