Paul A. Carpenter, MBBS, is the Medical Director for the Long-Term Follow-Up Clinical Service at the Seattle Cancer Care Alliance, Professor, Department of Pediatrics at the University of Washington School of Medicine, Attending Physician, Pediatric Bone Marrow Transplantation Outpatient Services, and Professor, Clinical Research Division Fred Hutchinson Cancer Research Center. His research interest focus is graft-versus-host disease, particularly in its chronic form, and late effects of BMT in both children and adults.