Ashley N. Gray, MD, MS

Attending Physician
Assistant Professor of Clinical Pediatrics, Keck School of Medicine of USC

Dr. Gray's research is focused on characterizing key perturbations in the gut microbiota associated with the most severe forms of gut graft-versus-host disease (GvHD) and evaluating novel therapeutic approaches to GVHD such as fecal microbiota transplantation (FMT).

Clinical Interests

Dr. Gray specializes in stem cell transplantation and immunotherapy for a variety of malignant and non-malignant diseases including allogeneic, autologous and gene-modified stem cell transplantations.


Medical School

St. George's University, School of Medicine


UCSF Fresno Medical Education Program, Pediatrics


UCLA Mattel Children's Hospital, Pediatric Hematology/Oncology Fellowship
Fred Hutchinson Cancer Research Center, Pediatric Bone Marrow Transplantation/Immunotherapy Fellowship



Pediatrics, American Board of Pediatrics


American Society of Transplantation and Cellular Therapy (ASTCT)
American Society of Hematology (ASH)
American Society of Pediatric Hematology-Oncology (ASPHO)
American Academy of Pediatrics (AAP)

Medical Awards

ASTCT Clinical Research Scholar 2022



Research Summary

Graft-versus-Host Disease (GVHD), Gut Microbiota, Fecal Microbiota Transplantation, Immune Reconstitution