DR. SUSAN EISEN practices functional natural medicine also described as root cause medicine. She is a Lyme literate holistic chiropractor and deeply involved with changing policy for Lyme patients in the United States. Dr. Eisen has been practicing in New York City since 1993. She is the first female chiropractor in New York State to receive reciprocal privileges to practice in the state, at a time when that honor was reserved only for chiropractors who had the finest records of practices.