Prof. Dr. Say Leong Ong is an Emeritus Professor at the Department of Civil and Environmental Engineering. He has been actively working in the field of water and wastewater treatment systems and water quality management. His extensive experience has led to his appointment as the Head of Internal (Technical) Audit Panel for Singapore Water Authority since 2004. He has also been serving as the Chairman of the Singapore National Technical Committee on Drinking Water Quality Standards from 2006 to 2024. Prof. Dr. Ong is a co-recipient of the Top 50 Engineering Feast@IES-SG50: NEWater Award and a recipient of the Public Service Star Award from the President of Singapore in 2016. His contributions to the field of water and wastewater engineering have led to him being elected as a Fellow of The Academy of Engineering Singapore.