2635 North 7th Street, Grand Junction, Colorado 81501      970-298-CARE (2273) / 1-800-458-3888
St. Mary's Hospital & Regional Medical Center
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From your first visit to St. Mary's Center for Brain & Spine Surgery through recovery and rehabilitation, St. Mary's support and medical staff members provide professional, confidential, and personalized care and service.

Our doctors are trained and experienced in all general neurosurgical procedures, and most have developed additional areas of special interest and skill through advanced training and experience. With the latest in diagnostic and surgical technology available, our surgeons integrate state-of-the-art methods with traditional techniques to provide the best care for each patient.

Meet our surgeons

Susan Reid Hemley, MD, PhD

Dr. Hemley is a board certified neurosurgeon with 20 years of experience in private and hospital-based practice in Pennsylvania, New Jersey, and Colorado. She joined St. Mary's in 2006.

After earning an undergraduate degree from Harvard University, Dr. Hemley received a doctorate in neurophysiology and medical degree from the University of Paris, France. She completed a general surgery residency at Lenox Hill Hospital in New York and a neurosurgical residency at Louisiana State University, New Orleans. She has also held faculty positions at Cooper University Hospital in Camden, N.J., and Charity Hospital, New Orleans.

Dr. Hemley performs all types of neurosurgical procedures and has developed special interest and expertise brain trauma, brain and spine tumors, pediatric conditions, Chiari malformations, hydrocephalus, and minimally invasive spine surgery.


Robert Henry Fox, MD 

Dr. Fox is board certified by the American Board of Neurological Surgery and has been practicing in Grand Junction since 1984.

He received his medical education at the University of Oregon Health Science Center in Portland. He completed neurosurgery internship and residency programs and served as chief resident in neurosurgery at the University of California, Los Angeles.

Dr. Fox treats all neurological disorders and injuries and has special interest in the treatment of trigeminal neuralgia, pituitary tumors, and hydrocephalus. He is also an instructor of advanced trauma life support techniques.


John Anthony Lopez, MD Lopez, John

Dr. Lopez joined St. Mary's Center for Brain & Spine Surgery in 2007 after practicing as a locum tenens physician in Alaska, California, Colorado, and Minnesota. 

He earned his medical degree from the University of Medicine and Dentistry of New Jersey - New Jersey Medical School in Newark. He completed his neurosurgical residency program at the University of Colorado and a fellowship in spine surgery at the University of California - Davis.

Dr. Lopez is board certified by the American Board of Neurological Surgery. He has a special interest in spinal surgery.


Brian P. Witwer, MD

Dr. Witwer joined the Center for Brain & Spine Surgery in 2006 after practicing in Kentucky, Indiana, and in private practice in Grand Junction. He is board certified with the American Board of Neurological Surgery.

Dr. Witwer earned his medical degree from Temple University Medical School in Philadelphia. At the University of Wisconsin Hospital, Madison, he completed an internship in general surgery, residency in neurological surgery, and an intra-residency spine fellowship. He also served as air transport physician for the University of Wisconsin Hospital & Clinics.

His areas of special interest include spinal surgery and complex spinal instrumentation.

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For more information

St. Mary's Center for Brain & Spine Surgery
St. Mary's Advanced
Medicine Pavilion
750 Wellington Avenue
Entrance 22 or 26
Suite 3A


Office hours:
Monday - Friday 
9:00 am- 5:00 pm

Prescription refill requests and medical records:
970-298-3190 Fax