Julia Seton was an American physician who moved into the New Thought movement and became one of its most travelled lecturers, founding a body she called the New Civilization Church. The movement she worked in had no central authority and no creed, and that is the point about it: it operated through lecture tours, magazines, correspondence courses and small independent centres, and it spread by attraction rather than by mission. Its common ground was a conviction that thought is causal, that mind shapes health and circumstance, and that the individual has access to a divine power directly rather than through an institution.
That structure explains a good deal about how the ideas moved. Because there was no denomination to join and no doctrine to subscribe to, New Thought material could be absorbed piecemeal by people who continued to regard themselves as ordinary Protestants, or as nothing in particular, and its vocabulary passed into popular psychology, advertising and self improvement writing without carrying a religious label with it. A great deal of what is now sold as motivation or manifestation descends from this milieu, usually without any awareness of the descent.
Her own position inside the movement was that of a professional. She had trained as a physician, and New Thought was full of people offering healing without medical training, which made a doctor on the platform something organisers were glad to advertise. The atlas notes that without drawing a conclusion from it, because the relationship between this movement and orthodox medicine ranged from open hostility to quiet coexistence depending on who was speaking.