Biography & Education

Dr. O’Neill is a board certified neurosurgeon in the United States as well as in the European Union. He completed his medical training at the Royal College of Surgeons in 1985 and his neurosurgery training started in Richmond and Beaumont hospitals in Dublin, Ireland. In 1988, Dr. O’Neill and his family immigrated to the United States where he received neurosurgery training at the University of Washington and at Oregon Health & Sciences University. In 1991 he was examined and admitted as a Fellow of the Royal College of Surgeons in Ireland. Dr. O’Neill’s particular interests are in the treatment of brain tumors, stereotactic radiosurgery, and in the surgical treatment of the vascular pathology of the brain. Dr. O'Neill has extensive peer reviewed publications and book chapters.
Areas of expertise

Brain and Spine Tumors, Cerebrovascular Neurosurgery, General Neurosurgery/Complex Spine, Peripheral Nerve Surgery, Intraoperative MRI Technology

  • MD, Royal College of Surgeons, Dublin, Ireland, 1985
  • Senior House Office, Neurosurgery, St. Laurence Hospital/Beaumount Hospital, Dublin, Ireland, 1985 - 1988
  • Residency, Surgery & Neurosurgery, University of Washington, Seattle, WA, 1988
  • Residency, Neurosurgery, Oregon Health & Science University, Portland, OR, 1989 - 1994
  • Fellowship, Neurovascular/Interventional, Oregon Health & Science University, Portland, OR, 1993
  • Attending Neurosurgeon, Oregon Health & Science University, 1994 - 1995
  • Clinical Instructor, Neurosurgery, Oregon Health & Science University, 1995 - Present
  • Chief of Department of Neurosurgery & Neurology, Providence St. Vincent Hospital, Portland, OR, 1998 - 1999 & 2012 - 2017
  • English
  • French

Care Locations

The Oregon Clinic-Neurosurgery East
5050 NE Hoyt St.
Suite 359
Portland , OR 97213
Fax 503-935-8505
The Oregon Clinic-Neurosurgery West
9155 SW Barnes Road
Suite 440
Portland , OR 97225
Fax 503-935-8505


Board Certifications
  • Neurological surgery