Ong Tian Soon (Charlie) is Managing Partner of ASAP Advisory PLT, professional practices specialising in ESG/Sustainability Assurance, Verification and Validation, Implementation and Improvement, Internal Audit, GHG Statement, Product Carbon Footprint Assessment Report, Training and Governance Advisory. A Fellow Chartered Management Accountant (FCMA, CGMA) and Chartered Accountant (MIA), he advises Malaysian PLCs and regional enterprises on sustainability assurance, ISSB/IFRS S1-S2 compliance, internal audit, and ISO-aligned governance systems.

Charlie has led multiple engagements in ESG assurance for Bursa-listed clients, development of sustainability policies, and training on ISSA 5000, IWA 48 ESG Implementation Principles, ISO 14001 Environmental Management System, ISO 22301 Business continues management system, ISO 20400 Sustainable Procurement, ISO 37001 Anti Bribery Management System, and ISO 31000 Risk Management System. ISO 14064 GHG, ISO 14067 Greenhouse gases — Carbon footprint of products.

He is also a regular speaker for professional bodies, university and corporate institution on ethics, sustainability reporting, and the evolving role of accountants in corporate responsibility.