Dunn Chiropractic Clinic- A Pain and Wellness Practice Since 1922. Dr. George Siegfried joined Dunn Chiropractic Clinic in 1984, after practicing in Italy as the chiropractor for the 1984 Italian Olympic Team’s Track and Field Division. Since 1922, Dunn Chiropractic Clinic has provided thorough state of the art care for patients needing regular chiropractic care, car accident injuries, sports medicine and rehab, chronic sinusitis, concussion injuries, and whole food nutritional concentrates.