William Walker Atkinson's 'The Power of Concentration (The Complete 20 Lessons)' is a timeless self-help classic that provides readers with practical techniques to enhance their focus and mental clarity. Written in a clear and straightforward style, Atkinson's book offers readers a comprehensive guide to harnessing the power of concentration in order to achieve success in various aspects of their lives. Drawing on principles of psychology and mindfulness, the author presents 20 lessons that are easy to follow and incorporate into daily activities. This book is an essential read for anyone looking to improve their productivity and achieve their goals by mastering the art of concentration.

William Walker Atkinson (1862–1932) was a prolific writer and a significant figure in the early 20th-century movement known as New Thought. His work primarily focused on the power of the mind and personal development, emphasizing the ability of thought to manifest reality. Atkinson was a practicing attorney before his interest in spiritual matters and mental discipline led him to become an influential author and publisher. Under pseudonyms such as Yogi Ramacharaka, Theron Q. Dumont, and others, Atkinson wrote extensively on subjects ranging from yoga, religion, to personal success, and psychic phenomena.

One of Atkinson's notable works is 'The Power of Concentration (The Complete 20 Lessons)'. This book encapsulates his insights on harnessing mental focus to improve one's life. Atkinson's teachings revolve around the concept that concentration is key to maximizing human potential, unlocking success, and influencing one's environment through the force of thought. His literary style combines practical advice with metaphysical reflection, providing readers with exercises and affirmations to strengthen their powers of concentration. The didactic nature of his work reflects both a guiding philosophy and a prescriptive set of practices aimed at self-improvement and mastery over one's mental faculties. Atkinson's enduring influence is evident in the continued popularity of his literature in the New Thought and self-help communities.