Esther was formerly attached to the Department of Mathematics and Science Education, Faculty of Education, University of Malaya. She has been a teacher educator for more than two decades. Previous to that she was a science teacher in premier schools such as Sekolah Datuk Abdul Razak, Seremban, the Malay College Kuala Kangsar and Sekolah Tuanku Abdul Rahman, Ipoh. Her area of expertise and background is in science education, environmental education, technology integration in the science classroom and learning and cognition and has conducted numerous training workshops and seminars related to research, pedagogies and has been a Master trainer for new lecturers in institutions of Higher Learning. Her research has focused on science education, in particular biology and environmental education. Numerous students under her supervision have successfully completed their postgraduate studies. She has worked with WWF-Malaysia in conducting in-depth research and in training teachers in infusing sustainable development education. She has published papers in journals as well as presented at various conferences both local and International. She has written numerous training modules for the teaching and learning of Science, for Environmental Education and for Qualitative Research Methods. More recently she has also been involved in Medical Education with a focus on the cognition of learning. Among the books she has written are ‘Biology Education in a Changing Planet’ and ‘Cognition in Science Education’. In 2016, Esther received the UNESCO-HAMDAN international award for the effective training of teachers. In 2017 she received the Venus International Women’s Award (VIWA) for a ‘Lifetime Achievement in Science Education (Specialisation-Biology). She has also served as the chair of the National Foundation for Environmental Education (FEE) Eco-Campus Committee. Recently (2018) she was awarded the Excellence Award for the academic with the highest international grant by the Universiti Malaya. Esther is now an Honorary Professor in the Medical Education, Research and Development Unit, Faculty of Medicine UM. She was involved with the development and implementation of the MOHRE (Master of Health Research Ethics) programme in the Faculty of Medicine. She is also attached to the UM-WWF-M Living Planet Centre, a research centre, as an affiliated member and has just completed the Sustainable Development nation-wide research. Esther together with PPPLS (Pertubuhan Pendidikan Pembangunan Lestari Selangor conducted a nation-wide resesearch - Education for Sustainable Development (ESD) research (2022-2023). Furthermore, she is also involved with the UNESCO-Chair Project for Education for Sustainable Development (2022 – 2024) in collaboration with Asia Pacific University (APU). Esther is also one of the consultants for the project ‘Transformational Learning through ESD: Mission 4.7’ with the Sustainable Development Solutions Network (SDSN) located at the Jeffrey Sachs Centre, Sunway University (2023-2024)