About Dr. Samuel Ryu

Dr. Samuel Ryu joined the Department of Radiation Oncology at Stony Brook University Hospital in April of 2014 as Department Chair and also serves as the Deputy Director for Clinical Affairs for the Stony Brook Cancer Center. He is not only a world-renowned expert in the field of radiosurgery of the brain, but also a recognized pioneer of radiosurgery for the spine and spinal cord tumors and has been instrumental in applying this similar treatment to other various body sites such as lung, pancreas and liver among other organs. Dr. Ryu’s research is focused on preventing and mitigating the toxicity to normal tissues from radiation reaction. He teaches in many educational and training programs throughout the nation. Though he is an active scholar and leader in basic research and clinical trials, Dr. Ryu is a compassionate physician whose primary goal is always the well-being of his patients.

Clinical Focus

  • Brain Tumors (benign and malignant)
  • Spinal Tumors (benign and malignant)
  • Trigeminal Neuralgia
  • Vascular Malformations
  • Head and Neck Cancers
  • Radiosurgery
  • Stereotactic Body Radiotherapy (SBRT)

Academic Appointments

  • Professor , Stony Brook Medicine -  Radiation Oncology (2014 – present )

Administrative Appointments

  • Deputy Director, Clinical Affairs, Stony Brook Cancer Center (2014 – present)
  • Chair, Department of Radiation Oncology, Stony Brook Medicine (2014 – present)

Boards, Advisory Committees, Professional Organizations (selected)

  • ASTRO and ACR Panel for Standards of Commission, Radiation Oncology Practice Guideline for Stereotactic Body Radiation Therapy (2003 – present)
  • Brain Tumor Steering Committee, RTOG (2004 – present)
  • Committee on Guideline of Radiosurgery for Glioblastoma for ASTRO, AANS (American Association of Neurological Surgery), and CNS (Congress of NeuroSurgeons).
  • President, International Stereotactic Radiosurgery Society (2013-2015)

Professional Education

Board Certification:

Radiation Oncology, American Board of Radiology (1997)


Henry Ford Hospital, MI (1996)


Kyungpook University Hospital, Korea (1986)

Medical Education:

Kyungpook University School of Medicine, Korea (1982)