Joshua Walker, M.D., Ph.D. 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.