Who is Parish from The Way of the Shaman and what is their importance?

Essie Parrish is a North American Indian shaman who uses "sucking" techniques in healing rituals. She hears as well as sees power intrusions; she reports hearing a disease that sounds like insects. She has a vision that she will share her knowledge of shamanic methods with non-Indians and made the film "Sucking Doctor". She is also known for integrating Christian concepts into traditional shamanic work.