A/Prof Marion Aw is a Senior Consultant in the Division of Paediatric Gastroenterology, Nutrition, Hepatology, and Liver Transplantation at the National University Hospital (NUH). She is also a Senior Consultant with the Paediatric Liver Transplantation Programme at the National University Centre for Organ Transplantation. A/Prof Aw is an Associate Professor at the Yong Loo Lin School of Medicine, National University of Singapore. Her clinical expertise includes paediatric gastrointestinal disease, hepatology, liver transplantation, and paediatric nutrition.

A/Prof Aw completed her medical education at the National University of Singapore (NUS) and further trained at NUH and King's College Hospital, London. She is actively involved in teaching, serving as Education Director at NUH and Vice Dean (Students) at NUS Yong Loo Lin School of Medicine. A/Prof Aw has also contributed to paediatric medical education through her leadership roles in residency training and curriculum development. She founded the Interdisciplinary Feeding and Nutrition Clinic and chairs the Paediatric Inflammatory Bowel Disease Regional Network.