Adj Associate Professor Lim Toon Wei graduated from the University of Sydney in 1997 with 1st Class Honours. He completed his physician's training in cardiology at Westmead Hospital (Sydney, Australia) and was admitted as a Fellow of the Royal Australasian College of Physicians in 2006. Following this, he was a Cardiology Research Fellow till 2009 at Westmead Hospital, working in the area of catheter ablation for cardiac arrhythmias, particularly that of atrial fibrillation. He was awarded a PhD from the University of Sydney for this research work, which included one of the largest randomized clinical trials of atrial fibrillation ablation techniques at that time.

Adj A/Prof Lim then joined the University of Ottawa Heart Institute in 2009 as a Clinical Fellow in Cardiac Electrophysiology, before returning to his hometown in 2010 to join the National University Heart Centre, Singapore (NUHCS) as a Consultant. He also serves as the Head of Community Cardiology and Clinical Lead for Telehealth, Department of Cardiology, National University Heart Centre, Singapore, as well as the Director of Community Specialist Integration at National University Health System.

While Adj A/Prof Lim sees general cardiology patients, his clinical and research interest is in cardiac arrhythmias (heart rhythm disorders). As part of his practice, he implants pacemakers, implantable cardioverter-defibrillators and cardiac resynchronisation pacemakers or defibrillators. He also performs both conventional and complex ablation procedures for all forms of arrhythmias.

Adj A/Prof Lim is active in medical education and has been a faculty member of the Cardiology Senior Residency Programme. He has also been serving in the Executive Committee of the Singapore Cardiac Society (SCS) Council since 2014 and was elected as the President in 2021.