Dr. Ng is a senior lecturer at Clinical Oncology Unit, Faculty of Medicine, University Malaya and a medical physicist at Universiti Malaya Medical Centre. He served as a radiation oncology medical physicist in the Department of Radiotherapy and Oncology, Hospital Kuala Lumpur and Institut Kanser Negara. He was an Assistant Director at Medical Radiation Surveillance Division, a national regulatory body in regulating radiation in medicine. He is the founder and served as the Chairman of the MOH Medical Physics Research Task Force which aimed to promote research culture and collaboration in the region since 2018. He also served as the Physics Advisory Editors for Medical Dosimetry, reviewers and member of editorial board for several local and international peer-reviewed journals. He is now serving as the Secretary-General of  Asia-Oceania Federation of Organizations for Medical Physics (AFOMP).