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Geoffrey P. Colby, M.D., Ph.D.

Geoffrey Philip Colby, M.D., Ph.D.
Assistant Professor of Neurosurgery

Male  | Languages: English, Spanish

Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Assistant Professor of Neurosurgery
  • Assistant Professor of Neurology
  • Assistant Professor of Radiology and Radiological Science

Centers & Institutes


  • Neurology
  • Neurosurgery - Vascular Neurosurgery
  • Radiology and Radiological Science


The Johns Hopkins Hospital

Appointment Phone: 410-955-2438

600 N. Wolfe Street
Sheikh Zayed Tower 6115C
Baltimore, MD 21287 map
Phone: 410-955-2438
Fax: 443-287-0338

Johns Hopkins Bayview Medical Center

4940 Eastern Avenue
Baltimore, MD 21224 map
Phone: 410-550-0100


Acute Stroke Care, Aneurysm Repair, Aneurysms, Arteriovenous Fistulas, Arteriovenous Malformations, Brain Tumors, Carotid Artery Stenosis, Carotid Artery Stenting, Cavernous Malformations, Cerebral Aneurysms, Dural Arteriovenous Fistulas, Endovascular Surgery, Moyamoya Disease, Neurosurgery, Stroke, Subarachnoid Hemorrhage


With combined training in open neurosurgery, endovascular neurosurgery, and interventional neuroradiology, Dr. Colby focuses on the surgical and endovascular treatment of aneurysms, arteriovenous malformations (AVMs), cavernous malformations, and dural arteriovenous fistulas (dAVFs) of the brain and spinal cord. These treatments include the most modern and sophisticated endovascular techniques of aneurysm flow diversion.

Dr. Colby has expertise in the pre-operative embolization of solid brain and spinal tumors. He also uses the latest surgical and endovascular techniques to treat patients with carotid artery stenosis, acute stroke, intracerberal hemorrhage (ICH), subarachnoid hemorrhage (SAH) and moyamoya disease. more

Featured Video

Meet our Experts: Dr. Geoffrey Colby

Dr. Geoffrey Colby focuses on the surgical and endovascular treatment of aneurysms, arteriovenous malformations, cavernous malformations, dural arteriovenous fistulas.

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