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.
Robert Langs
Robert Joseph Langs (June 30, 1928 – November 8, 2014) was a psychiatrist, psychotherapist and psychoanalyst, the author, co-author, and editor of more than forty books on psychotherapy and human psychology. Over the course of more than fifty years, Langs developed a revised version of psychoanalytic psychotherapy, currently known as the “adaptive paradigm”. This is a distinctive model of the mind, and particularly of the mind’s unconscious component, significantly different from other forms of psychoanalytic and psychodynamic psychotherapy.