Er. Ang Siew Lin, Audrey received a Bachelor of Engineering (Honours) in Electrical and Electronic Engineering from Nanyang Technological University (NTU), Singapore, in 2007. She is a member of The Institution of Engineers, Singapore (IES) and a registered professional engineer (electrical) with the Professional Engineer Board (PEB) since 2014.

In 2021, she joined Singapore Institute of Technology (SIT) as a senior professional officer. Prior to joining SIT, she has worked as an associate with DP Engineers Pte. Ltd.,  as a senior engineer with J. Roger Preston (S) Pte. Ltd.,  Hyflux Ltd., and SWTS Pte. Ltd., as a consultant with SWTS Consulting Engineers Pte. Ltd., and as an assistant electrical engineer with Parsons Brinckerhoff Pte. Ltd.

Professor Lock has a unique blend of practicing and academic experience acquired through a career which is equally split between the industry and the academia. He received his B.Sc. (1st Class Honours) in Electrical and Electronics Engineering in 1975 from the University of Strathclyde, UK. He completed his Ph.D. degree at the same university in 1979 researching on the design optimization of electrical machines. He joined the National University of Singapore as a lecturer in 1980 and was the Head of its Power and Machines Division, Department of Electrical Engineering, when he left in 1997 to set up his consulting practice. He returned to the academia in 2016 as a Professor at Singapore Institute of Technology.

He is an Emeritus President and Honorary Fellow of the Institution of Engineers, Singapore. He has served as a Board Member of the Professional Engineers Board, Singapore for 14 years. He is well-versed with standards and codes of practice and was the Chairman of Singapore Standards Council for 6 years, actively contributing to the promotion and establishment of Standards and Codes of Practice in Singapore. He plays an active role in energy efficiency, being the Chairman of Accreditation Committee for Energy Service Companies (ESCOs) and the Co-Chair of Steering Committee of Singapore Certified Energy Managers (SCEM) Scheme. He received the Public Service Medal (2015) and the Public Service Star (2020). He was conferred the Outstanding Power Engineer Award by the IEEE Power Engineering Chapter in 1998. He is a Fellow of Academy of Engineering, Singapore, Senior Fellow of ASEAN Academy of Engineering and Technology and Honorary Fellow of ASEAN Federation of Engineering Organizations. He is the co-author of a book “Grounds for Grounding: a Circuit-to-System Handbook”. The 2^nd edition was published by IEEE/John Wiley in 2023.