A well-informed partnership
for your healthcare

East Bay Brain & Spine Medical Group believes in educating patients in order to help them make well-informed decisions. We aim to maximize function, avoid surgery when possible, and to minimize recovery time so that patients return to their activities as quickly as possible. Using clear explanations and conversation, we take great pride in guiding patients through stressful times in their lives.

Dr. Maxwell Merkow Speaks

Maxwell B. Merkow, MD, FAANS

Dr. Merkow is a board-certified neurosurgeon with East Bay Brain & Spine Medical Group and BASS Medical Group in Walnut Creek, California. He specializes in minimally invasive/endoscopic approaches for common and complex spinal disorders as well as brain and pituitary tumors including stereotactic radiosurgery. Dr. Merkow treats Parkinson’s disease and essential tremor with deep brain stimulation devices, and he alleviates facial pain via microvascular decompression and focused radiation. His practice also includes the management of cerebral aneurysms.

After receiving his medical degree from Columbia University’s College of Physicians and Surgeons, Dr. Merkow completed a seven-year residency in neurological surgery at the University of Pennsylvania. As a postdoctoral research fellow, he studied the brain rhythms that underpin human memory and the effect of direct brain stimulation on memory. His research, also completed at the University of Pennsylvania, appeared in the journals Science and The Proceedings of the National Academy of Sciences, among others. Dr. Merkow completed a clinical fellowship at Wellington Public Hospital in New Zealand.

Dr. Merkow practices in Walnut Creek and has full privileges at John Muir Medical Center and the BASS ambulatory surgery center.

Matthew A. Piazza, MD


Bio Coming Soon!

Ehsan Ejaz, PA-C

Ehsan Ejaz is a board-certified physician assistant with a passion for neurophysiology and neurosurgery. Ehsan received his B.S. in Neurobiology, Physiology, and Behavior at UC Davis where he conducted extensive research at the Medical Investigation of Neurodevelopmental Disorders (M.I.N.D.) Institute at UC Davis and the Institute for Pediatric Regenerative Medicine at Shriners Hospital. Ehsan began gaining experience as a surgical neurophysiologist at Yale New-Haven Hospital.  He has conducted over 2000 intraoperative neuromonitoring consultations on a wide variety of cases. Keen to further his passion for neurosurgery and patient care, Ehsan then completed his Masters in Physician Assistant Studies at Samuel Merritt University. Ehsan’s philosophy for patient care involves empowering patients as equal members of their health care team, as patients are their own best advocates. Ehsan practices evidence-based medicine. He stays abreast of the latest developments and research by reviewing medical and neurosurgical literature as well as attending conferences. When he is not at the bedside or in the operating room, Ehsan can be found traveling to new places, hiking California’s expansive state parks, or capturing the perfect Milky Way photograph.

Michelle Marino

Office Manager/Medical Assistant

Michelle brings more than 10 years of clinical experience to East Bay Brain & Spine/BASS Neurosurgery Division. Above all, she is a patient advocate. Michelle’s dedication and caring nature manifest in the highest level of service to our patients.

Yadira Martinez

Medical Assistant
Yadira brings a passion for helping those in need to East Bay Brain & Spine/BASS Neurosurgery Division. The practice and our patients benefit from her diligence, sensitivity, and caring attitude. She is an integral member of our team. In her free time, Yadira likes to enjoy time with her friends and family, explore new hiking trails, and try new recipes.