About Henderson Center Henderson Center was founded in 1985 as The Henderson Center Chiropractic Clinic in King of Prussia, Montgomery County, Pennsylvania, but was strictly a chiropractic clinic until 1993, when Dr. M Jonathan Garzillo, a chiropractor, joined the Center. Since then, the Center has expanded beyond just chiropractic to become a multi-specialty pain management practice, incorporating massage therapies, shiatsu therapy and chiropractic care. Dr. Garzillo also brought a simple philosophy to the Henderson Center. Instead of trying to prolong care, the Center works to relieve patients of their pain in the shortest time possible. In a study of the Center in Dr. Garzillo's first 18 months, the Center achieved a 40% success rate of resolving patients' pain within one week, 70% within two weeks, and nearly 100% within eight weeks. While the Center does not guarantee results in a certain amount of time, it is committed to relieving you of your pain as quickly as possible. We are able to achieve these results by focusing intensely on the patient's personal needs and goals, by individualizing care, and by using the most effective combination of the wide variety of therapies available within our practice. This philosophy has not gone unnoticed by the Philadelphia Region medical community. While people often think that "medical doctors don't believe in chiropractors" ( or massage therapists, or shiatsu therapy ), our office is routinely referred to by local medical physicians for pain management and drugless pain relief. We even have some medical doctors as patients!