Dr. Walker is a radiation oncologist specializing in the treatment of adult patients with lung cancer and central nervous system cancers. This includes treatment of primary brain tumors such as glioblastoma as well as metastatic disease to the brain and benign tumors such as meningioma. He delivers advanced radiation treatments such as stereotactic body radiotherapy (SBRT) and stereotactic radiosurgery (SRS) in his practice. Dr. Walker is committed to delivering personalized, evidence-based, care for every patient and collaborates closely with neurosurgery, thoracic surgery and medical oncology in order to provide effective multidisciplinary care. 

In addition to his clinical practice, Dr. Walker also serves as the Director of Clinical Research for the OHSU Department of Radiation Medicine to facilitate access to trial therapy for our patients. As the Assistant Director of Cancer Research Education and Training at the Knight Cancer Institute, Dr. Walker also helps train future generations of scientists and doctors focused on cancer care. His laboratory research program is focused on developing new gene therapies in combination with nanoparticle delivery for the treatment of cancer. As part of his practice, he mentors and train medical students, residents, and future cancer researchers. In Dr. Walker's free time he enjoys traveling, hiking, golf and cooking with his wife and two children.