Diploma civil engineering, Singapore Polytechnic, 1962. Diploma in public health, Imperial College of Science and Technology, 1968.
Pupil engineer Public Works Department, Singapore, 1963-1966, engineer, 1966-1970, executive engineer, 1971-1972. Higher executive engineer to senior executive engineer, chief engineer Ministry of the Environmental, 1972-1977, chief engineer planning and design to assistant director, 1977-1982, head engineering service department to head sewerage department, 1982-1990, assistant director, 1990-1992, assistant director, head center for environmental training, 1993-1995. Director environmental policy and management division, 1995-2000.
Director Singapore Environmental Management and Engineering Services PTE Ltd., Singapore, 1995-2000. Chairman SEMAC Pte Ltd., Singapore, 1995-1998. Independent consultant Asian Development Bank, Manila, 1991-2000.
Member board management Environmental Technology Institute, Singapore, 1995-1999, director, 1995-1999. Member advisory committee Nanyang Technological University School of Civil and Structural Engineering, Singapore, 1996-2000. Hong Kong Advisory Council on the Environment, 1997-2000.
Board directors Environmental Corporation, 1998-2000. Advisor Newater project Singapore Public Utilities Board, 2000-2003.
Member Ngee Ann Polytech. Building Department Advisory Committee, Singapore, 1992-2000. President Public Works Department, Thrift and Loan Cooperative, Singapore, 1997-2000.
Fellow American Society of Civil Engineers, Institute of Water and Environmental Management (United Kingdom) (chartered). Member Institution of Engineers Singapore, Environmental Engineering Society of Singapore (honorary), New York Academy of Sciences.
Married Gim Loon Khoo, May 1, 1968. Children: Cheng Poh, Keith And Poh Choo, Katrina.