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Samuel Merrill MD, PhD

Samuel A Merrill MD, PhD

Instructor, Department of Medicine, Division of Hematology, Johns Hopkins University School of Medicine, Baltimore, MD

Dr. Merrill is a clinician scientist with laboratory investigations into mechanisms of severe anemias from altered erythrocyte survival. His research focuses on complement-mediated erythrocyte destruction, including atypical hemolytic uremic syndrome, paroxysmal nocturnal hemoglobinuria, autoimmune hemolytic anemia, and hyperhemolysis syndrome. He has a clinical interest in hemophagocytic lymphohistiocytosis (HLH), where his research focus is developing processes for timely diagnosis, quality improvement, and exploring novel therapies.

Dr. Merrill completed his MD/PhD training at Washington University in St. Louis, where his research focused on cellular pathways of vesicular transport involving the ESCRT pathway. He completed his Internal Medicine residency and Chief residency at the University of Vermont, and his Hematology fellowship and Chief fellowship at Johns Hopkins University.


Dr. Merrill reports no relevant disclosures.