Orange County Neurosurgeons

Our Neurosurgeons and Neurologists

Dr. Aaron Allen

Dr. Aaron Allen, M.D., Q.M.E.

Neurology, Neurophysiology, Pain Medicine

University of California Berkeley B.A. (Physics)
Berkeley, California

California State University San Francisco M.A. (Psychology)
San Francisco, CA

University of Southern California (M.D.)
Los Angeles, California

LAC/USC Medical Center (Medical Intern)
Los Angeles, California

LAC/USC Medical Center (Neurology)
Los Angeles, California

After entering private practice Dr. Allen worked in a variety of settings that ranged from solo practice to working in foreign medical centers in the Middle East. He has remained active in neurology and the management of neurological diseases. In addition to board certification in neurology, he has been previously certified in clinical neurophysiology and pain medicine. He is active in a number of national and international medical organizations.

In addition, Dr. Allen has maintained a keen interest in medical ethics and has served on hospital ethics committees, even chairing one for several years. He has also served as president of the Orange County Neurological Society. He is a fellow of the American Academy of Neurology, Royal Society of Medicine, American College of Forensic Examiners, and American Academy of Disability Evaluating Physicians.

Dr. Allen is committed to giving his patients optimal care that requires not only current medical knowledge but compassion and understanding.

Dr. Thomas Chappell

Dr. Thomas Chappell, M.D., F.A.C.S.


University of North Carolina B.A. (Chemistry)
Chapel Hill, North Carolina

North Carolina State University M.S. (Physiology)
Raleigh, North Carolina

Bowman Gray School of Medicine (M.D.)
Winston-Salem, North Carolina

George Washington University Hospital (General Surgery)
Washington, D.C.

George Washington University Hospital (Neurological Surgery)
Washington, D.C.

Dr. Chappell’s entire career of 16 years after his extended residency training has been working for medical universities in California, such as the University of California – San Francisco (formerly, Davis)– East Bay and the University of California – San Diego. He remains a professor of neurosurgery at the University of California – Irvine. His research and subspecialty interests have spanned the realm of neurosurgery. Dr. Chappell has written numerous publications, chapters in textbooks and has presented at numerous conferences in the areas of Brain Trauma, Brain Tumors, and Spine Surgery. He has special training in skull base surgery, stereotaxic techniques, and spine techniques.

Dr Chappell has been honored throughout his career for his attention to patient care and the instruction of students and residents. He is known throughout the medical community in Orange County as congenial, devoted, reliable, and of the utmost integrity. He has always attended to those patients with the least resources and most advanced diseases, making his outcomes for the less ill even better.

Dr. Chappell’s approach to practicing neurosurgery is unique in many ways. He has been a leader in minimally-invasive techniques for spine and brain surgery for more than 10 years. Dr. Chappell remains one of the few neurosurgeons in Southern California using minimally-invasive techniques routinely in his practice. Dr. Chappell is known for close interaction with his patients and their primary physicians. Both have prompt access to Dr. Chappell around the clock. He reliably spends sufficient time with patients in consultation so that they can make the most informed decision about having surgery.

Dr. Alex Etemad

Dr. Alex Etemad, M.D., B.S.E.

Orthopedic Surgery, Spine Surgery

University of Pennsylvania B.A. (Computer Engineering & Pre-med)
Philadelphia, Pennsylvania

George Washington University (Doctor of Medicine)
Washington, DC

University of Virginia (Department of Surgery & Orthopedic Surgery)
Charlottesville, Virginia

UCLA (Department of Orthopedic Surgery)
Los Angeles, California

Currently Dr. Etemad is a full-time member of Southern California Orthopedic/Sports Medicine Center. His clinical practice focuses on diagnosis and treatment of spinal injuries and disorders. He provides a full array of treatments for spinal pathology including, but not limited to, non-operative treatment of spinal strains, sprains, herniated discs, radiculopathy, myelopathy, fractures, and dislocations. His non-operative treatment modalities include physical therapy, epidural steroid injections, and facet joint injections. Dr. Etemad is a big believer on trying the conservative approach to pain management.

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