Mr Thein is a Director of United Overseas Bank Limited, a Board member and Chairman of the Audit Committee of several listed companies in Singapore, among them Haw Par Corporation Limited, GuocoLeisure Limited (previously known as BIL International Ltd), MobileOne Ltd, Guocoland Limited, MFS Technology Ltd, Keppel Telecommunications and Transportation Ltd, FJ Benjamin Holdings Ltd, Grand Banks Yachts Limited, Otto Marine Ltd. He is also a Director and Chairman of the Audit Committee of DLF Trust Management Pte Ltd, and a Director of Energy Support Management Pte Ltd and Ascendas Pte Ltd. Mr Thein is a Fellow of the Institute of Chartered Accountants in England and Wales, and member of the Institute of Certified Public Accountants of Singapore. He was previously a Senior Partner of PricewaterhouseCoopers, Vice Chairman of Coopers & Lybrand and Managing Partner of its management consulting services firm in 1999, he was awarded the Public Service Medal by the President of Singapore
