In 1985, Dr Mak graduated from the National University of Singapore with distinctions in Medicine and Microbiology. Dr Mak received his post-graduate training in Internal Medicine in Singapore and was awarded the Masters of Medicine (Internal Medicine) and admitted as a Member of the Royal Colleges of Physicians of the United Kingdom in 1989. He continued his training as a cardiologist and obtained specialist certification in 1993.
Prior to private practice, he was a senior consultant at the National Heart Centre practising cardiovascular medicicne and interventional cardiology and the founding director of the Clinical Trials Unit. Dr. Mak was appointed as the Director of Coronary Care Unit in 1996. For his dedication and service to his patients, Prof Mak was received the first Doctor of the Year Award from the Tan Tock Seng Hospital. Besides clinical work, Prof Mak was also actively involved in several public heart health programmes. He has served as a Director of the Singapore Heart Foundation and Chairman of the National Heart Week. To help consumers make informed food choices, Prof Mak has initiated the nation-wide Healthier Choice Food Labeling Programme in 1997 to help individuals understand more regarding the heart and heart disease, the book "Your Heart Matters" was published in 2006.
Dr. Lim is interested and specializes in general medicine including abnormal lipid profile, diabetes mellitus and hypertension. He also has interests in cardiovascular medicine including patients with coronary heart disease, heart valve disease, rhythm disorder and heart muscle disease, management of patients prior to cardiac and non-cardiac surgery and invasive coronary angiography and intervention.