After successfully completing both an MBBS and MS at the University of Colombo between 2000 and 2005, Mr Halahakoon was awarded fellowship of the Royal College of Surgeons of England upon obtaining FRCS in general surgery in 2012. He has, to date, undergone higher surgical training in Sri Lanka, Australia and in the UK, and possesses a diploma in advanced laparoscopic surgery, which he received from the University of Strasbourg, France.

Furthermore, Mr Halahakoon has also undergone advanced laparoscopy training at the Colchester General Hospital and is JAG-accredited in both gastroscopy and colonoscopy. Mr Halahakoon has a strong interest in surgical teaching and currently works as the undergraduate surgical tutor at Colchester General Hospital, ESNEFT and as a tutor at the ICENI Centre of the Colchester General Hospital, ESNEFT.

Mr Halahakoon is also the author of numerous research publications and his work has been published in several reputed journals. He has spoken at multiple national and international medical conferences and is a member of multiple medical organisations, including The Association of Surgeons of Great Britain and Ireland and The Royal College of Surgeons of England.