Sentara Healthcare Sentara Healthcare

About the Physicians and Staff

cott S. Williams, MD, PhD Scott S. Williams, MD, PhD       

Radiation Oncology

Assistant Professor
Eastern Virginia Medical School Health Services

Medical Director of Radiosurgery
Sentara Norfolk General  Hospital

600 Gresham Drive
Sentara Norfolk General Hospital
Norfolk, Virginia   23507

Medical Education:
MD : 1996
Medical Scientist Training Program, SUNY at Buffalo, School of Medicine

St. Mary's Medical Center, San Francisco, CA

Graduate School Education:
PhD Department of Molecular Immunology, Rosewell Park Cancer Institute, Graduate Division of SUNY at Buffalo

Radiation Oncology
Stanford University Hospital, Stanford, CA

Academic Appointments:
Assistant Professor
Eastern Virginia Medical School Health Services

Board Certifications:
Diplomate, American Board of Radiology
Diplomate, National Board of Medical Examiners

American College of Radiology
American Society for Therapeutic Radiology and Oncology
James A. Gibson Anatomical Society


Joseph L. Koen, MD Joseph L. Koen, MD

Neurosurgeon, Sentara Norfolk General Hospital

Dr. Koen, a native of Ohio, completed his undergraduate studies at The Ohio State University receiving degrees in chemistry and Spanish. He continued at Ohio State earning his M.D. degree in 1993. He then moved to North Carolina to train in neurosurgery at Duke University Medical Center. In 1999 Dr. Koen joined Neurosurgical Specialists, Inc. in Norfolk, Virginia. He is an Assistant Clinical Professor of Surgery at Eastern Virginia Medical School and Instructor in Neurosurgery for the Department of Otolaryngology, Head and Neck Surgery at EVMS. Dr. Koen is certified by The American Board of Neurological Surgery.

Dr. Koen’s professional activities include serving as past Chief of the Department of Neurosurgery at Sentara Norfolk General Hospital. He sits on the governing council for the Sentara Neuroscience Program, and is also the neurosurgical liaison to the Stroke Operations Committee. Since 2000 he has served as Medical Director for both the Brain Tumor Support Group and the Trigeminal Neuralgia Support Group of Hampton Roads.

Dr. Koen specializes in brain tumors, including skull base techniques and stereotactic radiosurgery (Cyberknife, X-Knife). He also has a special interest and expertise in cerebrovascular surgery including aneurysms and arteriovenous malformations (AVM’s). His current emphasis is on minimally invasive neurosurgery for both the brain and the spine. Dr. Koen has performed intracranial endoscopy for brain tumors, cysts, and hydrocephalus since 1995. He also has one of the region’s largest experiences in minimally invasive spinal surgery for both simple and complex conditions, including herniated disc, spinal stenosis, and degenerative disc disease.


Joseph D. Ong, M.D. Joseph D. Ong, M.D.


Neurosurgery At The Beach
1080 First Colonial Road, Suite 400
Virginia Beach, VA  23454
Phone: (757) 395-8720

Dr. Ong earned his medical degree at Temple University School of Medicine in Philadelphia, PA in 1999.  He received his M.A in Biomedical Engineering at Johns Hopkins University School of Medicine in Baltimore, Maryland in 1998 and his B. S. in Mechanical Engineering at the Massachusetts Institute of Technology in Cambridge, MA in 1992.

Dr. Ong completed his internship in the Department of Surgery at Thomas Jefferson University Hospital in Philadelphia, PA in 2000 and his residency in the Department of Neurosurgery at the University of Pittsburgh in Pittsburgh, Pennsylvania in 2007.

Dr. Ong was the recipient of the 2005 Neurosurgery Research and Education Foundation/DePuy Spine Resident Research Fellowship.

He is a member of the Congress of Neurological Surgeons, the American Association of Neurological Surgeons and the American Medical Association.


David C. Waters, M.D. David C. Waters, M.D.


Neurosurgical Specialists Inc

Crown Center - Downtown Norfolk
580 E. Main Street
Suite 200
Norfolk, Virginia 23510

Kempsville - Halifax Building
6161 Kempsville Circle
Suite 155
Norfolk, Virginia 23502
Telephone Number: (757) 625-4455

Medical School:

University of Michigan Medical School
Ann Arbor, Michigan


University of Michigan Hospitals
Ann Arbor, Michigan


University of Michigan Hospitals
Ann Arbor, Michigan


University of Maryland Medical Center
Baltimore, Maryland

Board Certification:

American Board of Neurological Surgery


Ran Vijai Singh, MD Ran Vijai Singh, MD
Neurosurgeon, Sentara Norfolk General Hospital

Assistant Professor of General Surgery, Eastern Virginia Medical School,
Norfolk, Virginia

Neurosurgical Associates
400 Gresham Drive, Suite 200
Norfolk, VA 23507

1788 Republic Road, Suite 100
Virginia Beach, VA 23454

Board Certification:
Diplomate American Board of Neurological Surgery

Medical School:
MLN Medical College, 1980

Residency and Fellowship Training:
Jackson Memorial Hospital at University of Miami, 1995-2000

Clinical Interests:
- Specializing in Complex Spine Surgery
- Fellowship Trained in Neurotrauma
- Fellowship Trained in Vascular & Skull Base Surgery

Dr. Eric Feliberti Dr. Eric Feliberti

General Surgery & Surgical Oncology
Assistant Profession, Eastern Virginia Medical School Health Services

Department of Surgery
825 Fairfax Ave
Norfolk , VA 23507

Department of Surgery-Princess Anne Campus
1950 Glenn Mitchell Drive
Suite 208
Virginia Beach, VA 23456

Board Certification:
Diplomate American Board of Neurological Surgery

Medical Education:
MD : 1999
University of Texas Medical Branch, Galveston, TX

Surgical Oncology
City of Hope National Medical Center,l Duarte, CA

Board Certifications:
General Surgery

Society of Surgical Oncology
Candidate Member, American College of Surgeons
American Medical Association
Virginia Surgical Society
Norfolk Academy of Medicine
Society of American Gastrointestinal Endoscopic Surgeons
Southeastern Surgical Congress
Association of Academic Surgeons

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