Dr. Tan is a family physician in Singapore, and Adjunct Assistant Professor in Family Medicine at the Yong Loo Lin School of Medicine and the Duke-NUS Graduate Medical School.
He is the President of the College of Family Physicians, Singapore, and President of the COPD Association, Singapore. He has special interests in chronic illnesses, like asthma, COPD, hypertension, diabetes mellitus and hyperlipidaemia. He is first Vice President of the Singapore Medical Association and also Honorary Secretary of the Singapore Association of Medical Journal Editors. He is an advocate for primary care research and care integration.