Charles Francis Haanel was a noted American New Thought author and a successful businessman. He is best known for his significant contributions to the New Thought movement, particularly through his book, The Master Key System.
The Master Key System, published in 1912, is structured as a course covering topics such as New Thought, mental development, financial success, and personal health. The book gained popularity and was heavily promoted in The Nautilus, a New Thought magazine edited by Elizabeth Towne. By 1933, it had sold over 200,000 copies worldwide.
As a self-made success, Haanel practiced the financial principles he preached and owned several major companies. His achievements in business and his philosophical writings have left a lasting impact on the New Thought movement.