Home > About > Our Team > Radiobiology Faculty Our Team Leadership Faculty Residents & Fellows Medical Faculty Physics Team Radiobiology Faculty Mary Helen Barcellos-Hoff, Ph.D. Professor, Vice Chair, Research, Director of Radiation Biology Department of Radiation Oncology John P. Murnane, Ph.D. Professor Department of Radiation Oncology Paola Betancur, Ph.D. Assistant Professor Department of Radiation Oncology James Lee, MD Assistant Professor Department of Radiation Oncology Redefining Possible