Harry Van Gelder is a pioneer in applying the Field Theory approach to the diagnosis ad treatment of disease. Born in Indonesia in 1907 to Dutch parents, he went to Australia where he studied science and engineering at the University of Sydney. He began his career as an engineer, building factories with his father in India. During World War II he served as a member of the Princess Irene Brigade. His interests in the area of healing emerged at the age of 23 when he learned the Indonesian science of herbs and homeopathy which he practiced during the 1930s. In England, he received degrees in osteopathy, physiotherapy, and naturopathy. In India, he studied naturopathic Ayur Vedic the methods of scientific inquiry with Eastern philosophy to make numerous original contributions to the healing arts during more than 50 years of his life.