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Our Team

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Our Expert Team Working on Your Behalf

Expertise, collaboration and innovation are essential in providing the best possible care for today while advancing novel treatments for tomorrow. From diagnosis to treatment, as well as education and support, we are here for you.

PNI Medical Group Physicians

(Listed alphabetically)

Abbas A Anwa MD

Abbas A. Anwar, MD

ENT Surgery
Garni Barkhoudarian, MD

Garni Barkhoudarian, MD

Neurosurgery
Jesus Barreto Ahrams PhD

Jesús O. Barreto Abrams, PhD

Clinical Neuropsychology
David M Butler MD

David M. Butler, MD

ENT Surgery Plastic & Reconstructive Surgery
William G Buxton MD

William G. Buxton, MD

Adult Neurology
Jose Carrillo MD

Jose Carrillo, MD

Neuro-Oncology
Natalie Diaz, MD

Natalie Diaz, MD

Neurology
Barbara Giesser, MD

Barbara Giesser, MD

Multiple Sclerosis Neurology
Shanthi Gowrinathan MD

Shanthi Gowrinathan, MD

Psycho-oncology
Chester F. Griffiths, MD

Chester F. Griffiths, MD

ENT Surgery PNI Founder
Jian Guan MD, Spine Surgeon

Jian Guan, MD

Spine Neurosurgery
Keith Heinzerling, MD

Keith Heinzerling, MD

Addiction Medicine, Treatment & Research In Psychedelics
Samuel Hou headshot

Samuel Hou, MD, PhD

Neurointerventional Surgery
Adi Iyer MD

Adi Iyer, MD, MS

Neurosurgery, Neuro-interventional Surgery
Scott A. Kaiser, MD

Scott A. Kaiser, MD

Geriatric & Family Practice
Daniel F. Kelly, MD

Daniel F. Kelly, MD

Neurosurgery PNI Director & Founder
Santosh Kesari, MD, PhD

Santosh Kesari, MD, PhD

Neuro-Oncology PNI Founder
Amit Kochhar MD

Amit Kochhar, MD

ENT Surgery Facial Nerve Plastic & Reconstructive Surgery
Howard R. Krauss, MD

Howard R. Krauss, MD

Eye Neuro-ophthalmology PNI Founder
Jean-Philippe Langevin, MD

Jean-Philippe Langevin, MD

Neurosurgery
Rebecca Lewis AuD

Rebecca Lewis, AuD

Audiology
Dr Omid Mehdizadeh

Omid Mehdizadeh, MD

ENT Surgery Voice & Swallowing
David Merrill MD PhD

David A. Merrill, MD, PhD

Geriatric Psychiatry
Sandra Narayanan MD

Sandra Narayanan, MD

Vascular Neurology, Neurointerventional Surgery
Stella Panos MD

Stella Panos, PhD

Clinical Neuropsychology
Melita Petrossian, MD

Melita Petrossian, MD

Neurology
Verna R Porter MD

Verna R. Porter, MD

Adult Neurology
Christopher Putman, MD

Christopher Putman, MD

Neurointerventional Surgery
Nouzhan Sehati MD

Nouzhan Sehati, MD

Neurosurgery
Akanksha Sharma MD

Akanksha Sharma, MD

Neuro-Oncology
Walavan Sivakumar MD

Walavan Sivakumar, MD

Neurosurgery
Alexander M Solomon MD

Alexander M. Solomon, MD

Eye Neuro-ophthalmology
Jason Tarpley, MD, PhD

Jason Tarpley, MD, PhD

Neurointerventional Surgery
Courtney Voelker MD PhD

Courtney Voelker, MD, PhD (DPhil Oxon)

Ear ENT Surgery
Naveed Wagle, MD

Naveed Wagle, MD

Neuro-Oncology
Evan Walgama MD

Evan S. Walgama, MD

Head & Neck Surgical Oncology