In addition to these works, Atkinson wrote a great many books on New Thought, which achieved wide circulation becaming both popular and influential among New Thought practitioners. Atkinson returned to legal practice in 1903 in Illinois, all the while strengthening his abilities through New Thought Practices. In 1916 he started writing articles for Elizabeth Towne's magazine The Nautilis. From 1916 to 1919 he edited the journal Advanced Thought, and was for a time honorary president of the INTA (International New Thought Alliance).

Atkinson used many pseudonyms including: Theodore Sheldon, Theron Q.Dumont, Swami Panchadasi, The Three Initiates, Magus Incognitus and probably others not identified at present. He wrote books together with Eduard E. Beals and Laurion, William De Laurence. He wrote a series named The Arcane Teachings, published at Arcane Books Co., with 6 volumes, without signature. Among these books we can identify and comproof his authority in Arcane Formula or Mental Alchemy; The Cosmic Laws; and Vril, or, Vital Magnetism.

William Walker Atkinson died on November 22, 1932, in California -- he will always be remembered as one of the greats of New Thought.