Our Team

Meet Our Experienced, Highly Qualified Team

Our Spine Center is run by an expert team of highly skilled and extensively trained neurosurgeons and orthopedic surgeons, whose use of state-of-the-art surgical interventions and equipment has resulted in excellent patient outcomes.

Recognized as a Blue Distinction Center for Spine Surgery by Blue Shield of California, we pride ourselves on our high rate of surgical success and low rate of complications.

Please take a moment to meet our team of surgeons:

Christian Athanassious, M.D.

Orthopedic Surgeon

Dr. Christian Athanassious is a board-certified spine surgeon who specializes in conditions of the spine. An advocate of the whole-body medical approach to treating patients, Dr. Athanassious completed his undergraduate degree in Psychology from UC Davis with the intention of pursuing his medical doctorate. With a thorough background in psychology, Dr. Athanassious never loses sight of the mind and body connection when considering the best treatment for his patients.

Dr. Athanassious received his medical degree from the Drexel University College of Medicine. He then completed his orthopedic residency at Monmouth Medical Center in Long Branch, New Jersey, and was selected to serve as the Chief Resident in his final year. Dr. Athanassious went on to complete his spine fellowship at Stanford University. Dr. Athanassious is a member of the American Academy of Orthopedic Surgery, North American Spine Society, and the Society of Lateral Access Surgery.

Dr. Athanassious was born in Scotland, raised in the U.S., and has been a longtime resident of California. He is married and enjoys many physical activities including mountain biking, skiing, martial arts, and running.

Kurtis Birch, M.D.


Dr. Kurtis Birch is a board-eligible neurosurgeon with St. Joseph Health Medical Group. Dr. Birch has interests in general neurosurgery and spinal surgery, including spinal instrumentation. He has a specific focus on pituitary tumors and surgical treatments for movement disorders.

Dr. Birch graduated with a medical degree from Boston University and then completed his residency in Neurologic Surgery at Cedars-Sinai in Los Angeles, CA.

Dr. Birch enjoys playing golf and working on his muscle car. He grew up in Utah and attended the University of Utah prior to moving to Boston for medical school.

Giac Consiglieri, M.D.


Dr. Giac Consiglieri is a board-certified neurosurgeon with St. Joseph Health Medical Group, and the Director of Neurosurgery and Neurotrauma at Santa Rosa Memorial Hospital. In addition to general neurosurgery, his specialty interests include cranial surgery for brain tumors as well as spine trauma. Dr. Consiglieri believes in a multispecialty approach to the treatment of the degenerative spine with an extremely conservative approach to surgical decision making.

Dr. Consiglieri graduated with his medical degree from the University of Southern California. He completed both his residency training in Neurological Surgery and infolded fellowship in Spine Trauma and Complex Spinal Instrumentation at the Barrow Neurological Institute in Phoenix, AZ. Dr. Consiglieri is a member of the Congress of Neurologic Surgeons, and upon board-certification, the American Association of Neurologic Surgeons.

When Dr. Consiglieri is not seeing patients or in the OR, he enjoys spending time with his wife and young daughters, as well as mountain biking. He was raised in Santa Rosa and has returned home following his years away for school and training.

Rasha Germain, M.D.


Dr. Germain is a board-eligible neurosurgeon who specializes in cranial and spinal tumors, and complex spinal disease. She grew up in Southern California and attended the University of California, Los Angeles, then graduated from the University of Southern California with a degree in Medicine. She completed her internship in Surgery at Banner Good Samaritan Hospital in Phoenix and her residency in Neurosurgery at the Barrow Neurological Institute. Dr. Germain had a successful private practice in Spokane, Washington as a member of a seven surgeon group, serving a large regional medical center before relocating to Santa Rosa.

Dr. Germain is a member of the following professional health organizations, including the Congress of Neurological Surgeons and Sonoma County Medical Association

Alexander Iezza, M.D.

Orthopedic Surgeon

Dr. Alexander Iezza is a board-certified orthopedic surgeon who specializes in conditions of the spine, including minimally invasive lumbar fusion surgery and microdecompression surgery.

Dr. Iezza graduated from Chicago Medical School at Rosalind Franklin University of Medicine and Science, where he was an elected member of Alpha Omega Alpha Honor Medical Society, a professional medical organization that advocates excellence in scholarship and the highest ideals in the medical profession. Dr. Iezza completed his residency in orthopedic surgery at Stanford University and a fellowship in spine surgery at St. Mary's Medical Center in San Francisco. During his fellowship, he served as clinical instructor in the Department of Orthopedic Spine Surgery at Stanford University.

Dr. Iezza was born and raised in Petaluma. In his free time, he enjoys spending time with his family, mountain biking, and participating in other outdoor activities.

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