Trained as a veterinarian, Dr Yuen is a veterinary microbiologist with expertise in pathobiology, host-pathogen interactions, and immunology in infectious diseases. Currently, he is a veterinary virologist at the Elizabeth Macarthur Agricultural Institute within the NSW Department of Primary Industries and Regional Development, and holds an adjunct research fellow position at the School of Veterinary Science at UQ. While his current research focuses on vaccine development and immunology, he has active collaborations with academics in universities and research institutes in the areas of antimicrobial resistance, disease biomarkers discovery, epidemiology of emerging zoonotic diseases, and disease pathogenesis.