Dr. Makar is board-certified in transfusion medicine and serves as the associate director of the Blood Transfusion Service (BTS). He oversees outpatient and clinical apheresis services for the BTS, including the collection of peripheral blood hematopoietic stem cells from mobilized patients and donors, extracorporeal photopheresis to treat chronic graft-versus-host disease, and therapeutic plasma exchange to treat various autoimmune diseases. His clinical interests include cellular therapies such as hematopoietic stem cell transplantation, the diagnosis and treatment of autoimmune cytopenias, and transfusion complications related to HLA alloimmunization such as transfusion-related acute lung injury and refractoriness to platelet transfusion.  He is a respected teacher in clinical pathology, having twice received the Clinical Pathology Excellence in Teaching Award.