Professor Chong Yap Seng is the Dean of the Yong Loo Lin School of Medicine and a clinician-investigator with a special interest in fetal growth and early development. He is also the Chief Clinical Officer (COO) of the Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A*STAR) and the Lien Ying Chow Professor of Medicine in the Department of Obstetrics & Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore (NUS). He is the Lead Principal Investigator of the Growing Up in Singapore Towards healthy Outcomes (GUSTO) and the Singapore Preconception Study of long-Term maternal and child Outcomes (S-PRESTO) studies. He is also a Senior Consultant in the Department of Obstetrics & Gynaecology at the National University Hospital (NUH), and a member of the Executive Group of the National University Health System (NUHS) as well as a board member of the National Medical Research Council.

His other research interests include strategies to promote breastfeeding, natural childbirth, and intrapartum and postpartum management issues. He has over 350 research publications, including papers in The Lancet, JAMA, and BMJ, and received more than $100 million in research grant funding. He also has numerous collaborations with industry, particularly in the area of early human development and nutrition. He was awarded the National Outstanding Clinician Scientist Award by the Ministry of Health in 2017.