Our Doctors
At QuantumCore Medical, our doctors are the heart of what we do. They’re not just experts in their fields — they’re passionate about patient care, always ready to listen, and committed to delivering personalized treatment. Get to know the professionals who make your health their top priority.
Meet Our Medical Experts
Our panel of board-certified physicians represents a diverse range of specialties and extensive experience in independent medical evaluations. Each doctor listed below has been carefully selected for their clinical expertise, objectivity, and professionalism in the med-legal field. Click on any headshot to view a detailed biography and a condensed CV, including credentials, board certifications, and relevant case experience.
Dr. Andrew Brown - Orthopedic Surgeon
University of Missouri, Columbia School of Medicine, and completed his orthopedic surgery residency at the University of Colorado Health Sciences Center. Dr. Brown further specialized with a Sports Medicine Fellowship and an NIH Fellowship in Musculoskeletal Science at the University of Iowa.
Dr. Calvin Cajigal - Board-certified Pain Management Specialist
He specializes in advanced pain treatment. His medical training includes a pain management fellowship at the University of Iowa Hospital and Clinics and an anesthesiology residency at Case Western Reserve University – MetroHealth Medical Center. Dr. Cajigal earned his Doctor of Medicine degree through the prestigious six-year combined program at the University of Missouri-Kansas City.
Dr. Donald Bassman - Orthopedic Surgeon
A highly experienced orthopedic surgeon with decades of expertise in treating musculoskeletal injuries and conditions. He completed his medical degree and orthopedic residency at Washington University in St. Louis. Dr. Bassman has a distinguished career with roles at prominent medical institutions, including Barnes-Jewish Hospital, St. Luke's Des Peres Hospital, and St. Joseph’s Hospital.
Dr. Jacques Van Ryn - Orthopedic Surgeon
An accomplished orthopedic surgeon. He earned his B.S. in Life Science from the United States Air Force Academy and his M.D. from Albany Medical College. He completed his orthopedic surgery residency at Wilford Hall USAF Medical Center and later served as Chairman of the Department of Orthopedic Surgery at Scott Air Force Base.
Dr. Joseph Yazdi - Neurosurgeon
Highly accomplished neurosurgeon and medical director. He specializes in complex neurosurgical procedures, minimally invasive spinal surgery, traumatic brain injury care, and spinal deformity correction. He received his medical degree from Drexel University College of Medicine and completed his neurosurgery residency at Hermann University and the University of Medicine and Dentistry of New Jersey.
Dr. Michael Snyder - Neurologist
Highly accomplished and board-certified neurologist with specialized expertise in neuromuscular medicine, electromyography (EMG), and headache disorders. He earned his medical degree from the University of Iowa Carver College of Medicine before completing his residency and fellowship in neurology at Barnes-Jewish Hospital, Washington University in St. Louis.
Dr. Raymond Cohen - Neurologist
An established neurologist. He received his medical degree from Texas A.T. University of Health Sciences. Post graduate training included an internship at Capitol Reginal Medical Center and residence with the neurology department at St. Louis University Medical Center.
Dr. John Coury - Orthopedic Surgeon
Experienced orthopedic spine surgeon with a focus on comprehensive care for spine-related conditions and musculoskeletal injuries. He earned his medical degree from the Lake Erie College of Osteopathic Medicine and completed his orthopedic surgery residency at the Valley Consortium for Medical Education in Modesto.
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