Dr. Jack has been practicing medicine for over 25 years. As a functional medicine practitioner, Dr. Jack helps his patients to better understand their bodies and their needs and then prescribes a customized map for them to follow on their unique journey to optimal health. Functional Medicine and Chiropractic Care: Dr. James Jack has extensive training in functional medicine and chiropractic care. He graduated from the National University of Health Sciences in 1996 with his Doctorate in Chiropractic. In addition, he also has completed over 1,000 hours of additional functional medicine training.