Geoffrey Colby, MD, PhD is a neurosurgeon and expert specialist in the open microsurgical and minimally-invasive endovascular treatment of cerebrovascular disorders of the brain and spine. He is the Director of Cerebrovascular Neurosurgery and an Associate Professor of Neurosurgery and Radiology at UCLA. Dr. Colby is also the Director of the Neurosurgery Residency training Program at UCLA and Chair of the AngelMD Clinical Advisory Board Department of Neurosurgery. As with all of the AngelMD Clinical Advisory Board Chairs, Dr. Colby is a driven innovator and loves to see the status quo improved for the benefit of patients.


Dr. Colby is a world-class expert using flow diversion for treatment and cure of brain aneurysms. He is the only neurosurgeon on the West Coast certified to train and proctor physicians on the use of all FDA-approved flow diverting stents and intravascular devices for treatment of brain aneurysms. He is sought after to assist other specialists and provide guidance on complex aneurysm procedures across the country and internationally. He also performs embolization for subdural hematoma (SDH) and tumors of the brain and spine.


Dr. Colby’s research explores technical advances to improve patient outcomes and the development of novel devices to treat cerebrovascular disorders. He has co-authored more than 100 peer-reviewed scientific articles and book chapters, and he has served as the principal investigator for many clinical studies testing new endovascular devices to treat cerebral aneurysms and stroke. He has lectured around the world on 4 continents, and he is a reviewer for the main scientific journals in the field of cerebrovascular disorders.


Dr. Colby joined UCLA in 2017 from The Johns Hopkins University School of Medicine in Baltimore, where he was an Assistant Professor of Neurosurgery, Neurology and Radiology. During his tenure there, he performed thousands of neurosurgical procedures and was an avid researcher. His passion for teaching earned him the Department of Neurosurgery Chairman’s Award of Excellence, and the Neurosurgery house staff at Johns Hopkins presented him with the Richard J. Otenasek, Jr. Faculty Teaching Award. While at UCLA, he has been awarded similar honors for excellence in teaching and education, receiving the Ulrich Batzdorf, MD Gold Teaching Award.


Dr. Colby received his MD and PhD degrees from Columbia University in New York City. He completed his internship and neurosurgery residency at The Johns Hopkins Hospital, as well as a two-year fellowship in endovascular neurosurgery and interventional neuroradiology. He joined the Johns Hopkins faculty in 2013.



He is an avid outdoor enthusiast and has participated in triathlons, marathons, and mountaineering expeditions. He also enjoys casual jogs, bike riding, and hiking.