A sustainability practitioner for over two decades, Esther published the first sustainability report in Singapore in 2008 and issued the first green bond by a Singapore company in 2017. Conferred the 2018 SDG Pioneer for Green Infrastructure and A Low Carbon Economy by the UN Global Compact and named a G20 EMPOWER Advocate in 2022, Esther sits on the boards or advisory platforms of international organisations including Global Reporting Initiative, GRESB Foundation Board, World Green Building Council Corporate Advisory Board, and the UN PRI Real Estate Advisory Committee. She chairs the Singapore Sustainability Reporting Advisory Committee, the Asia Pacific Real Estate Association's ESG Committee; co-chairs the Urban Land Institute Singapore's Sustainability Product Council and is the vice-chair of the Singapore Institute of Directors' ESG Committee. She founded Women4Green and Youth4Climate networks to empower women and youths to champion climate action and sustainable development.