Faculty Directory

Mei-Sing Ong

Assistant Professor

Mei-Sing Ong is Assistant Professor of Population Medicine at Harvard Medical School and Harvard Pilgrim Health Care Institute. She received her PhD in Health Informatics from the University of New South Wales in Australia and completed her postdoctoral fellowship at the Computational Health Informatics Program at Boston Children’s Hospital and the Department of Biomedical Informatics at Harvard Medical School.

Dr. Ong has a multidisciplinary background in computer science, biomedical informatics, epidemiology, pediatric health research, and patient safety research. As a scientist working at the intersection of informatics and medicine, her research applies computational methods to clinical data to advance understanding of disease epidemiology, health care systems, and safety and effectiveness of therapeutic interventions, with a focus on the pediatric population. Her work has contributed to the advancement of data-driven methods for the study of a range of clinical problems. Her current research focuses on optimizing treatment of chronic diseases in children, preventing harms caused by diagnostic errors in frequently underdiagnosed or misdiagnosed diseases, and addressing disparities in health outcomes among underserved populations. For her work on diagnostic errors, Dr. Ong was selected as a scholar for the inaugural 2021-2022 National Academy of Medicine Diagnostic Excellence Award. She currently serves as PI for an R21 focused on improving representation of minority children in clinical trials, and an R01 focused on improving diagnosis of primary immune deficiency in underserved populations.

Focus Areas:

  • Health Informatics
  • Big Data
  • Pediatrics
  • Chronic Diseases
  • Health Disparities and Equity
  • Patient Safety


Disease Progression of WHIM Syndrome in an International Cohort of 66 Pediatric and Adult Patients. (Pubmed Abstract)