Dr. Ong Choon Nam is a Professor at the School of Public Health, National University of Singapore (NUS)and was the Director of NUS Environmental Research Institute (NERI), 2009 -2018. He is an editorial board member of several international journals on environment and sustainability. Prof Ong is currently a member of the WHO Expert Panel on Guidelines for Drinking Water Quality. He served as a board member of Public Utilities Board, Singapore (2000-2008), and also as an advisor to the OECD, Center for Disease Control and Prevention, China, and the US National Water Research Institute.Dr.Ong Chaired the International Expert Panel which advised the Ministry of the Environment and Water Resources of Singapore on the NEWater study (1997-2004). His team received the TechConnect Innovation award (Washington, 2015) for their on-line senor to monitor surface water Quality.Some of his research works were presented at the World Economic Forum Innovation Section. He is currently involving a programmatic research related to NEXUS of Space, Water and Energy for Sustainable Urban Agriculture. He has published more than 350 scientific articles in international peer-reviewed journals with an h-indexof 87and over 24,000 citations.