A/Prof Loh is Senior Consultant at the Department of Otolaryngology Head & Neck Surgery, National University Hospital Singapore. His practice is in Head and Neck Surgical Oncology. He leads the Head and Neck Tumour Group at National Cancer Institute Singapore (NCIS). He has some publications and grants, the majority of which are on nasopharyngeal carcinoma (NPC) and in the area of screening or early detection. He is also the Group Chairman of Medical Board at National University Health System.