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 amongst 25 Trailblazing Women against Climate Change by Reuters in 2023 as well as the inaugural TIME100 Climate Leaders in Business 2023 list, Esther sits on the boards or advisory platforms of international organizations including:
- World Economic Forum Nature-Positive Cities Global Commission
- UN PRI Real Estate Advisory Committee
- UN ESCAP Sustainable Business Network Executive Council
- Global Reporting Initiative (GRI) Supervisory Board
- GRESB Foundation Board
- Urban Land Institute Net Zero Product Council APAC

Esther also chairs the following Committees:
- World Green Building Council Corporate Advisory Board
- Asia Pacific Real Estate Association’s ESG Committee
- Singapore Sustainability Reporting Advisory Committee

She founded Women4Green and Youth4Climate networks to empower women and youths to champion climate action and sustainable development.