Dr Leong obtained his Bachelor of Medicine and Bachelor of Surgery from the National University of Singapore in 1993. He completed his Fellowship examinations in Otolaryngology from the Royal College of Physicians and Surgeons of Glasgow in 2001.
In 2004, Dr Leong received the SingHealth Health Manpower Development Programme award from the Ministry of Health to be trained in Rhinology and Allergy. He was accepted into this prestigious one-year hands-on fellowship programme at the world-renowned Cleveland Clinic Educational Foundation, USA. The fellowship director was Professor Martin J. Citardi, and Co-Director Professor Pete Batra, both of whom are international authorities in Rhinology. Professor Citardi is Ocurrently the chairman of the department of Otolaryngology, Head & Neck surgery, University of Texas Medical School at Houston, USA.
Since his return to the Singapore General Hospital in 2005, Dr Leong has pioneered the usage of Image-guided surgery in ENT) especially in functional endoscopic sinus surgeries (FESS) and minimally invasive endoscopic surgeries of sinonasal and skull base tumours. He was in the evaluation committee for the setting up of the Khoo Teck Puat Neuro-Navigation Integrated Operating Suites.
He was awarded the Fellowship of the American Rhinologic Society (ARS) in 2007. The ARS is the premier physician organization whose mission focuses upon the medical and surgical treatment of patients with diseases of the nose and paranasal sinuses.
He is internationally recognized for his surgical expertise and academic contribution to the field Nasal Allergy, Rhinology and Nasopharyngeal Cancer (NPC) screening using the Narrow Band Imaging.
He is one of only a handful of ENT doctors that are specially trained in both medical and surgical treatments of nasal conditions ranging from allergy to sinusitis in both children and adults. He is also specialized in performing revision endoscopic sinus surgery in patients that had failed previous nasal surgeries.
He is also a pioneer in Sublingual immunotherapy in Singapore which is offered mostly to the Paediatric ENT population. Dr Leong is visiting consultant in the Department of Otolaryngology, Singapore General Hospital and KK Women’s and Children’s Hospital. Over the years in these two hospitals, he has acquired special interest in both adult and Paediatric ENT conditions including tonsils, adenoids, ears, thyroid, throat, salivary glands and sleep conditions.
Dr Leong also directs internationally acclaimed courses that teach ENT Allergy including food allergy, asthma and eczema and their impact on all ENT diseases.
He is the Director of SARC (Singapore Allergy & Rhinology Conference) for the past 11 years: this is one of the largest Singapore ENT meetings.