Dr. Hayashi is a Professor of Pediatrics in the Division of Pediatric Hematology/Oncology at Washington University and at St. Louis Children’s Hospital. Dr. Hayashi's research interest primarily focuses on issues regarding the long term effects of cancer therapy. His efforts examine the nature and spectrum of clinical conditions that effect childhood cancer survivors with the goal of developing interventions that will improve the outlook of this patient population.Dr. Hayashi's clinical interests also include bone marrow transplantation, Non-Hodgkin's Lymphoma and post-transplant lymphoproliferative disease (PTLD). He is actively involved in national trials advancing the treatment of patients in these areas.