PNI Doctors Receive 2025 Awards from Castle Connolly

We’re pleased to share that several physicians from the Pacific Neuroscience Institute® team have been recognized as Castle Connolly Top Doctors for 2025—a respected designation that highlights outstanding clinical excellence and peer recognition.

Understanding the Award 

Castle Connolly Top Doctors is an accolade awarded to the top 7% of all U.S. practicing physicians. These doctors are selected through a peer-nomination process and are known for their clinical excellence and interpersonal skills. 

Honoring Pacific Neuroscience Institute Doctors 

We are very proud of our PNI and PNI-affiliated physicians named to the 2025 Castle Connolly Top Doctors list. Congratulations to all the physicians for their remarkable achievements. Their hard work and dedication are an inspiration, and we look forward to their continued contributions to the field of medicine. 

PNI Medical Group Recipients

Garni Barkhoudarian, MD

Neurosurgery

David M. Butler, MD

ENT Surgery Plastic & Reconstructive Surgery

Chester F. Griffiths, MD

ENT Surgery PNI Founder

Jian Guan, MD

Spine Neurosurgery

Daniel F. Kelly, MD

Neurosurgery PNI Director & Founder

Howard R. Krauss, MD

Eye Neuro-ophthalmology PNI Founder

Jean-Philippe Langevin, MD

Neurosurgery

Omid Mehdizadeh, MD

ENT Surgery Voice & Swallowing

Walavan Sivakumar, MD

Neurosurgery

Courtney Voelker, MD, PhD (DPhil Oxon)

Ear ENT Surgery

PNI-Affiliated Recipients

Pejman Cohan, MD

Endocrinology

Sheldon Jordan, MD

Neurology

Kian Karimi, MD

ENT Surgery Nose Plastic & Reconstructive Surgery

About Pacific Neuroscience Institute

Pacific Neuroscience Institute provides advanced and precise medical care for individuals with various neurological disorders. Our team consists of experts in specialized fields, including neurosurgery, neurology, neuro-oncology, neuro-ophthalmology, neuro-psychology, psychiatry, endocrinology, otolaryngology (ENT), and interventional neuroradiology. Working together, we take a collaborative and comprehensive approach to diagnose and treat patients, aiming to quickly understand their condition and provide focused care that is minimally invasive yet highly effective, ultimately with the goal of enhancing quality of life.