Dianetik : Die moderne Wissenschaft der geistigen Gesundheit : 1

L. Ron Hubbard was an American author and founder of Scientology. His most famous work, "Dianetics: The Modern Science of Mental Health," revolutionized self-help literature. Hubbard's writing style was straightforward and practical, focused on empowering individuals to improve their lives through his teachings on the mind and spirit.