A holistic therapist is an individual who has been trained in the art of holistic therapy. Holistic therapy is treatment which aims to treat a client as a whole, rather than as a being separated into different parts which do not interconnect.Holistic therapy treats the individual’s body, spirit, and mind. holistic therapist is an individual who has been trained in the art of holistic therapy. Holistic therapy is treatment which aims to treat a client as a whole, rather than as a being separated into different parts which do not interconnect.