Radiation Oncology Residency Program

The Radiation Oncology Residency Program will be accepting applications for the 2020 Residency Match.  Learn how to apply!

The Radiation Oncology Residency Program is an ACGME-accredited four-year radiation oncology residency. The mission of the Radiation Oncology Residency Program is to cultivate outstanding radiation oncologists equipped with the knowledge and skills to build productive and fulfilling careers as clinicians, educators, researchers and advocates. We strive to provide this training in a diverse, inclusive, collegial educational environment where trainee's wellbeing and professional development are among our utmost priorities and in alignment with the University's mission of healing, teaching and discovery. Training is provided by a combination of supervised clinical experiences, seminars, lectures and research assignments designed to expand the trainee’s clinical skills and to provide a broad scientific basis for growth.  The trainee’s rotation to various segments of the program follow a pattern of progressively increasing responsibility throughout the four year post internship training.

Learn about our residency program, including curriculum, application requirements and much more.

The Radiation Oncology Residency Program aims to provide a strong, progressive clinical experience in radiation oncology along with the very necessary basic science and research support. The program will provide a combination of supervised clinical experiences, seminars, lectures and research assignments designed to expand the resident’s clinical skills and to provide a broad scientific basis for growth. The aims for the Radiation Oncology Residency Program include:

  • Train physicians to think critically and independently for the practice of patient-centered radiation oncology with graduated responsibility as residents demonstrate competence.
  • Promote a culture of safety and continuous system-based improvement.
  • Provide an advanced educational experience in all radiation oncology subspecialties.
  • Provide opportunities for research and/or professional development during residency.
  • Develop well-adjusted residents through the promotion of resident well-being and happiness.
  • Promote diversity and inclusiveness in the workforce.

Program leadership

John Holland, M.D.

Dr. Holland is an associate professor of radiation medicine and vice-chair of Education. He received a medical degree from Washington University in St. Louis and completed his residency at the University of California. Dr. Holland was inducted as a Fellow of the American College of Radiology (ACR) in 2019. He has been part of OSHU’s medical staff since 1994. 

Nima Nabavizadeh, M.D.

Dr. Nabavizadeh is an assistant professor of radiation medicine and serves as program director of the medical residency program. He received his medical degree from University of Oklahoma College of Medicine and completed his residency at OHSU. Dr. Nabavizadeh was an inductee to the Alpha Omega Alpha honors society for medical academic excellence.  He also holds a degree in Mechanical Engineering from the University of Oklahoma. 

Ravi Chandra, M.D., Ph.D.

Dr. Chandra is an assistant professor of radiation medicine and serves as associate program director of the medical residency program. He received his medical degree from Johns Hopkins University School of Medicine, his doctorate degree from the University of California and completed his residency at the Harvard Radiation Oncology Program. He also holds a bachelor's degree in chemistry & biological Sciences from Stanford University.

Program faculty

Aaron Grossberg, M.D., Ph.D.

Dr. Grossberg is an assistant professor of radiation medicine and co-director of the program's radiation biology curriculum. He received his medical and doctorate degrees from OHSU and completed his residency training at University of Texas -  MD Anderson Cancer Center. Dr. Grossberg’s practice focuses on cancers of the pancreas and breast.

Arthur Hung, M.D.

Dr. Hung is an associate professor of radiation medicine and medical director of the Radiation Therapy Training Program. He received his medical degree at The Ohio State University and completed his residency at the University of Texas – MD Anderson Cancer Center. Dr. Hung's practice focuses on cancers of the genitourinary tract, gastrointestinal tract, hepatobiliary system, soft tissue sarcomas, and melanomas.

Charles R. Thomas, M.D.

Dr. Thomas is professor and chair of the Department of Radiation Medicine and is an active member of the Knight Cancer Institute. He received his medical degree from the University of Illinois College of Medicine and is trained in medical oncology and radiation oncology. He has obtained triple-board certification in Radiation Oncology (American Board of Radiology), Medical Oncology and Internal Medicine (American Board of Internal Medicine). He is a member of the National Cancer Institute’s Rectal-Anal Cancer Task Force.

Jenna Kahn, M.D.

Dr. Kahn is an assistant professor of radiation medicine and faculty advisor for the Radiation Medicine Student Interest Group. She received her medical degree from Warren Alpert School of Medicine at Brown University and completed her residency at Virginia Commonwealth University.  Dr. Kahn specializes in gynecologic cancers and their treatment using both Intensity Modulated Radiation Therapy (IMRT) and Image-Guided High Dose Rate (HDR) Brachytherapy.

Jerry Jaboin, M.D., Ph.D.

Dr. Jaboin is an associate professor of radiation medicine and executive vice-chair of the Department of Radiation Medicine. He received his medical and doctorate degrees from Howard University and completed his residency at Vanderbilt University. Dr. Jaboin specializes in caring for children with cancer and individuals with brain tumors and women's cancers, and has experience in treating a wide variety of cancers and benign diseases.

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

Dr. Walker is an assistant professor of radiation medicine and co-director of the program's radiation biology curriculum. He received his medical and doctorate degrees at OHSU and also completed his residency at OHSU. Dr. Walker's clinical interests are primarily focused on tumor immunotherapy and radiotherapy of solid tumors.

Kiri Cook, M.D.

Dr. Cook is an assistant professor of radiation medicine. She received her medical degree from the University of Miami Miller School of Medicine and completed her residency at University of California Los Angeles. Dr. Cook's primary focuses are breast and gynecologic, however she is trained to treat all types of cancer.

Pehr Hartvigson, M.D.                       

Dr. Hartvigson is an assistant professor of radiation medicine and a radiation oncologist at the CMH-OHSU Knight Cancer Collaborative in Astoria, Oregon. He received his medical degree from the University of Washington as well as completed his residency at the University of Washington.

Reid F. Thompson, M.D., Ph.D.

Dr. Thompson is an assistant professor of radiation medicine and a member of the Knight Cancer Institute’s Computational Biology Program.  He received his medical and doctorate degrees from the Albert Einstein College of Medicine and completed his residency at the University of Pennsylvania. He also holds degrees in genetics and biophysical chemistry.

Sahar Rosenbaum, M.D.                       

Dr. Rosenbaum is medical director of Radiation Oncology Services at the CMH-OHSU Knight Cancer Collaborative in Astoria, Oregon. She received her medical degree from the Medical College of Pennsylvania and completed her residency at Cooper Hospital. Dr. Rosenbaum has been treating cancer patients for over 20 years.

Timur Mitin, M.D., Ph.D.

Dr. Mitin is an associate professor of radiation medicine and  medical director of Tuality/OHSU Cancer Center in Hillsboro, Oregon. He received his medical and doctorate degrees from Tufts University and completed his residency training at the Harvard Radiation Oncology Program. Dr. Mitin's clinical interests are in the treatment of genitourinary malignancies, especially bladder preservation therapy for patients with muscle-invasive bladder cancer.

Program Director

Nima Nabavizadeh, MD

Dr. Nima Nabavizadeh serves as Medical Residency Program Director. He earned a degree in mechanical engineering from University of Oklahoma, a medical degree from University of Oklahoma College of Medicine and completed his residency at OHSU. He was an inductee to the Alpha Omega Alpha honors society for medical academic excellence. After completing his residency in 2016, he joined the Department of Radiation Medicine as an assistant professor.

Dr. Nabavizadeh specializes in lymphoma and gastrointestinal cancers.