He has performed over 20,000 cardiac surgeries including over 1,000 redo bypass surgeries and over 3,000 high-risk surgeries. He has specialized in coronary artery bypass grafting using only arterial grafts, beating-heart surgery, redo bypass surgery, valve repair, complex aneurysms. He is one of the safest heart surgeons in the world with a 99.6% success rate in bypass surgery. He is a Padma Bhushan awardee and has trained in the US and UK. His most famous patient has been Dr Manmohan Singh, erstwhile Prime Minister of India.