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.
George M. Stratton
George Malcolm Stratton (September 26, 1865 – October 8, 1957) was an American psychologist who pioneered the study of perception in vision by wearing special glasses which inverted images up and down and left and right. He studied under one of the founders of modern psychology, Wilhelm Wundt, and started one of the first experimental psychology labs in America, at the University of California, Berkeley. Stratton's studies on binocular vision inspired many later studies on the subject. He was one of the initial members of the philosophy department at Berkeley, and the first chair of its psychology department. He also worked on sociology, focusing on international relations and peace. Stratton presided over the American Psychological Association in 1908, and was a member of the National Academy of Sciences. He wrote a book on experimental psychology and its methods and scope; published articles on the studies at his labs on perception, and on reviews of studies in the field; served on several psychological committees during and after World War I; and served as advisor to doctoral students who would go on to head psychology departments.