Mr Ong is a practising lawyer and a Director at Drew & Napier LLC where he heads the tax practice group. Mr Ong holds both a Bachelor in Accountancy and a Bachelor of Laws (Honours) Degree. He is a nonpractising Certified Public Accountant in Singapore and a member of the Singapore Institute of Directors. He serves on the Board of Emirates National Oil Company (Singapore) Pte Ltd, Innovalues Limited, Metal Components Engineering Limited, Sunningdale Tech Limited, TM Asia Life Singapore Ltd, TM Asia Insurance Singapore Ltd and Unidux Electronics Limited.