Grace Mahowald is an Assistant in Pathology at Massachusetts General Hospital and an Instructor in Pathology at Harvard Medical School. She is the Assistant Director of the Massachusetts General Hospital Histocompatibility Laboratory and Medical Director in the Core Laboratory. She is a Diplomate of the American Board of Histocompatibility and Immunogenetics, and is on the Executive Committee for the American Transplant Society Transplant Diagnostics Community of Practice. Grace’s clinical interests include histocompatibility in solid organ and bone marrow transplantation, refractoriness to platelet transfusion, as well as mass spectrometry and toxicology.