William Walker Atkinson (1862–1932) was an influential figure in the early 20th-century movement known as New Thought, which emphasizes the power of the mind in personal development and healing. Atkinson began his career as an attorney in Pennsylvania, but after experiencing a personal health crisis and subsequent recovery, he became deeply interested in mental and spiritual healing, which led to his involvement with New Thought principles. He wrote extensively under his own name and various pseudonyms, including Theron Q. Dumont and Yogi Ramacharaka, penning more than 100 books on the subjects of the power of the mind, personal development, the occult, psychic phenomena, and yoga. Atkinson's work under his own name includes 'The Master Mind' (1913), in which he delves into the concept of mental power and influence, exploring the idea that individuals can achieve extraordinary control over their own mental faculties and thereby influence the external world and others. His writing embodies the didactic and expository style characteristic of New Thought literature, emphasizing practical techniques such as visualization, affirmation, and mental focus to unlock potential and achieve success. Atkinson's legacy includes not just his contribution to the corpus of New Thought writings but also his role in setting the foundation for subsequent self-help and motivational literature.