Stanford Moyamoya Center

Our Team

Gary K. Steinberg, MD, PhD

Gary K. Steinberg, MD, PhD
Chair, Department of Neurosurgery
Co-Director, Stanford Stroke Center
Bernard and Ronni Lacroute-William Randolph Hearst
Professor of Neurosurgery and the Neurosciences

As founder and Co-Director of the Stanford Stroke Center, Dr. Steinberg has practiced medicine at Stanford for more than 20 years. He has pioneered stereotactic microsurgical techniques to repair intracranial vascular malformations and certain aneurysms that were previously considered untreatable. He has also refined revascularization techniques for patients with cerebrovascular occlusions, as well as moyamoya disease.

Dr. Steinberg is currently investigating an innovative approach to improve stroke recovery by transplanting neural cells into damaged brain tissue.

Michael Marks, MD

Michael Marks, MD
Chair, Interventional Neuoradiology
Director, Stanford Stroke Center Neuroradiology
Professor of Radiology and (by courtesy) Neurosurgery

As Director of Neuroradiology for the Stanford Stroke Center, Dr. Marks oversees the endovascular treatment program. Using catheter-based approaches, he has pioneered techniques to effectively cure cerebral aneurysms by inserting platinum coils and using special glues to obliterate arteriovenous malformations. Dr. Marks has also employed endovascular techniques to treat ischemic cerebrovascular disorders. He has a broad experience with cerebral angioplasty, and he is currently developing a new laser therapy for vaporizing intracranial thrombi.

Penelope Zeifert

Penelope Zeifert, PhD
Chief, Neuropsychology Services
Co-Director, Stanford Center for Memory Disorders

Dr. Zeifert has been director of the Stanford Neuropsychology Service for 15 years, and co-director of the Stanford Center for Memory Disorders for 10 years. She oversees the Moyamoya Neuropsychology Program, in which baseline cognitive-behavioral evaluations are provided to adult patients prior to surgery, and the results used to help guide ongoing treatment at neurosurgical follow-up. She and colleagues Peter Karzmark, PhD, Gary Steinberg, MD, PhD, Teresa Bell-Stephens, CNRN, and Les Dorfman, MD, have been collaborating on an ongoing research program to evaluate the neurocognitive changes of moyamoya disease before and after treatment.

Robert Dodd, MD, PhD

Robert Dodd, MD, PhD
Assistant Professor of Neurosurgery and Radiology

Dr. Dodd received his medical degree from the Stanford University School of Medicine, where he also earned a PhD in Neurosciences from the Department of Neurobiology. His neurosurgery training also took place at Stanford, where he recently completed an endovascular fellowship. His research interests have been in cerebral blood vessel reactivity and stroke. Dr. Dodd's clinical interests include endovascular and microsurgical treatment of intracranial aneurysms and arteriovenous malformations; percutaneous and surgical interventions for both extracranial and intracranial carotid artery occlusive disease; and minimally invasive neurosurgery though the use of neuroendoscopy and keyhole approaches.

Huy Do, MD

Huy Do, MD
Associate Professor of Radiology and (by courtesy) Neurosurgery

Dr. Do employs interventional neuroradiologic approaches to treat both ischemic and hemorrhagic cerebrovascular disorders. He has developed expertise in cerebral angioplasty and intra-arterial thrombolysis,as well as the treatment of aneurysms, arteriovenous malformations and cerebral vasospasm.

Dr. Do's current research focuses on evaluation of neuroprotectants for ischemic strokes, development of novel laser microdevices for emulsification of intracranial clots, stenting of carotid and vertebral arterial stenoses, evaluation of new liquid embolic agents for arteriovenous malformations, neuroimaging of strokes, vascular malformations, aneurysms using advanced MRI techniques, and treatment of painful compression fractures with acrylic cement.

Teresa Bell-Stephens

Teresa Bell-Stephens, CNRN

Teresa has worked with the Department since 1990. She has an extensive background in critical care, and her current focus is on coordinating the cerebrovascular surgery program, with an emphasis on moyamoya disease, vascular malformations and intracranial aneurysms. Teresa is a frequent lecturer for Bay Area nurses on various neuroscience nursing topics and has presented many papers at the annual meetings of the American Association of Neuroscience Nurses (AANN) and the World Federation of Neuroscience Nurses (WFNN). She has published peer reviewed neuroscience nursing articles in various journals.

Joli Vavao

Joli Vavao, MSN, ACNP, CNRN

Joli joined the Neurosurgical team in 2004. She obtained her master's degree as an acute care nurse practitioner from the University of California, Los Angeles. She has worked as a nurse for over 13 years specializing in neurosurgery and stroke neurology. She has received national certification in neuroscience nursing. She plays an active role coordinating the care of cerebrovascular patients in both an inpatient and outpatient setting. She participates in lectures to hospital staff and local health care professionals regarding the care of neuroscience patients.


Mary L. Marcellus, RN

Mary L. Marcellus, RN

Originally from Connecticut, Mary came to Stanford in 1980. She began as a staff nurse in the ICU and then went on to become an Assistant Nurse Manager for several years before taking on the role of Interventional Neuroradiology Nurse Coordinator in 1993. She has lectured on various cerebrovascular topics as well as published several articles in her area of expertise. Patient advocacy remains the most important part of her daily patient care responsibilities.



Melissa Lewis, NP-BC

Melissa Lewis, NP-BC

Melissa has been a registered nurse at Stanford since 2006, working with the neurosurgery and general patient populations. She graduated from UCSF in 2011 as a nurse practitioner, and now works with patients and their families in the inpatient and outpatient settings. She coordinates care for patients with vascular malformations, Moyamoya, aneurysms and tumors.




Jennifer Lea Ross, NP

Jill MacInnes

Jill joined the neurosurgery team in 2006 and is involved with the Stanford Moyamoya Center in multiple capacities. The mother of a moyamoya patient who had surgeries at Stanford in 2004, Jill is closely connected with our patients and with moyamoya support groups. She also coordinates social networking efforts, and plans and organizes the annual Moyamoya Picnic. Jill brings years of administrative experience in a variety of medical settings, helping to coordinate the teamís efforts, as well as providing outreach and support to patients, families and staff.

Robert (Bob) Pulliam

Bob has worked at Stanford since 1981 and joined the Neuroscience team in 1995. He has a vital role with moymoya patients to coordinate scheduling, which is quite a challenge for most coming from long distances. Due to his years of knowledge and contacts, Bob is the go-to-guy for getting things done in the clinic. He also helps patients navigate the sometimes complex insurance system.

Bobís team approach in working with radiology, outside departments and Lucile Packard Children's Hospital has made it easier for our moyamoya patients to maneuver through tests, scans and multiple location sites. The interests of the patient and family are always foremost in his approach, that includes helping secure accommodations and travel, and working with Guest Services to facilitate patientís specific needs.

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