David Scadden, a hematologist and oncologist, is one of the most noted stem cell researchers in [Page 998]the world. Along with Douglas Melton, Scadden founded Harvard University’s Stem Cell Institute within the Department of Stem Cell and Regenerative Biology. With more than 1,000 scientists involved in the effort, the institute houses the largest gathering of stem cell researchers anywhere in the world. Scadden’s research at Harvard uses adult stem cells to develop therapies for blood diseases, HIV, and cancer; it concentrates on lymphoma, multiple myeloma, hematology, and leukemia. While most of his time is spent in the laboratory, Scadden also continues to practice medicine. At Massachusetts General Hospital, he founded and directs the Center for Regenerative Medicine and is the head of the Hematologic Malignancies ...