Gustav Fechner
Fechner, along with Wilhelm Wundt and Hermann von Helmholtz, is recognized as one of the founders of modern experimental psychology. His clearest contribution was the demonstration that because the mind was susceptible to measurement and mathematical treatment, psychology had the potential to become a quantified science. Theorists such as Immanuel Kant had long stated that this was impossible, and that therefore, a science of psychology was also impossible.
Dianetics: The Modern Science of Mental Health
Dianetics: The Modern Science of Mental Health (sometimes abbreviated as DMSMH) is a book by L. Ron Hubbard about Dianetics, a system of psychotherapy he developed from a combination of personal experience, basic principles of Eastern philosophy, and the work of psychoanalysts such as Sigmund Freud. The book is a canonical text of Scientology. It is colloquially referred to as Book One. The book launched the movement, which later defined itself as a religion, in 1950. As of 2013, New Era Publications, the international publishing company of Hubbard's works, sells this book in English and in fifty other languages.