At Dana-Farber, he was the Edward P. Evans Professor of Myelodysplastic Syndromes and director the Center for Prevention of Progression of Hematological Malignancies; at Harvard he co-directed a new course in stem cell biology and regenerative medicine. He has served on the Food and Drug Administration Oncology Drugs Advisory Committee (FDA ODAC), Education Chair for the American Society of Hematology (ASH), editor of several ASH publications including ASH Clinical News, and Art of Oncology section editor of the Journal of Clinical Oncology, and published >450 articles on topics in hematology, hematopathology and medical history.