Medical Director, Radiation Oncologist

John Halligan, MD


  • Bachelors of Science: United States Military Academy at West Point
  • Doctor of Medicine: Uniformed Services University of the Health Sciences, Bethesda, Maryland
  • Internship: Walter Reed Army Medical Center, Washington, D.C.
  • Residency, Radiation Oncology: University of Washington Medical Center, Seattle, Washington Board Certified in Radiation Oncology


Dr. Halligan has been active in academic and clinical cancer care for more than 20 years. Prior to his retiring from the United States Army as a Colonel and moving to Alaska in 2008, he served as the Assistant Chief of Radiation Oncology at Walter Reed Army Medical Center and Chief of Radiation Oncology at Madigan Army Medical Center in Washington. He currently serves as the Medical Director of Radiation Oncology at Providence Alaska Medical Center and Medical Director of Peninsula Radiation Oncology.


Dr. Halligan was the developer and principal investigator of a $4 million Congressionally Directed Medical Research Grant evaluating real time organ motion in radiation therapy resulting in numerous publications and presentations. He has been actively involved in clinical research both in the Army and since entering private practice as a member of the Radiation Therapy Oncology Group, Southwest Oncology Group, Gynecology Oncology Group and Childrens’ Oncology Group as well as being a member of both the Providence Alaska Medical Center Cancer Research Committee and Cancer Committee. Dr. Halligan is the former lead and a current member of the Providence/Swedish Hospital System Radiation Oncology Focus Group, aimed at improving cancer care across the entire Providence/Swedish System.


Dr. Halligan has a broad clinical background with special interest in brain tumors, head and neck cancer, breast cancer, prostate cancer and cervical cancer as well as image guided radiation therapy and highly conformal radiation oncology technologies.