Dr Loo Choon Yong is the Executive Chairman of Raffles Medical Group Limited, one of Singapore 's leading private integrated healthcare providers. He cofounded the Raffles Medical Group in 1976 and was appointed to his current position in 1997. Dr Loo holds a number of directorships in several companies, including International Medical Insurers Pte Ltd, Raffles Hospital Pte Ltd and CapitaLand-Raffles Properties Pte Ltd.

Dr Loo was appointed by the President of Singapore as the Ambassador to the Italian Republic from March 2006 and was appointed by the Government of Singapore as a Nominated Member of Parliament from January 2007.

As public service, Dr Loo chairs the Sentosa Development Corporation Ltd and National Council Against Drug Abuse (NCADA). He also serves as Council Member to the North East Community Development Council (CDC) and a member of the Board of Trustees of Singapore Management University (SMU) and Chinese Development Assistance Council (CDAC). He is also the Chairman of the Asian Medical Foundation Ltd.

Dr Loo was the Deputy Chairman of the Action Committee for Entrepreneurship (ACE), a public-private collaboration to promote entrepreneurship in Singapore . He also served as a member of the Government Economic Review Committee (ERC) and Chairman of the ERC's Healthcare Services Working Group (HSWG). He was appointed by the Minister for Finance to the Council on Corporate Disclosure and Governance (CCDG), a national body on corporate disclosure and governance including prescribing of accounting standards in Singapore .

Besides his medical training, Dr Loo also read Law at the University of London and is a member of Middle Temple.