H. Joachim Deeg (born 18 July 1945) is a German-American hematologist and physician-scientist known for his work in hematopoietic stem cell transplantation, graft-versus-host disease, and the treatment of bone marrow failure syndromes, myelodysplastic syndromes (MDS), and myeloproliferative neoplasms (MPN). He is professor emeritus in the...