Dr. Walker is an assistant professor with the departments of Radiation Medicine and Cell, Developmental and Cancer Biology. His primary research interests are to understand the mechanisms that underlie T cell dysfunction in cancer and to help develop multi-modality treatment regimens to prevent or reverse this dysfunction. His clinical training is in radiation oncology and much of his recent work has pursued a better understanding of how radiotherapy can be used with immunomodulation to stimulate and reactivate tumor-specific CD8 T cells.