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 S. Woodworth
Additionally, Woodworth published "Contemporary Schools of Psychology" in 1932. He described the history of psychology according to a view that differing schools of psychology are complementary and not incompatible. This tolerant, open-minded view was likely a result of his unique perspective of psychology, being part of the subject for nearly the entire fifty years of its existence. He was renowned for this contribution, later being known as the dean of American Psychology.