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.
Wilhelm Wundt
In 1875, Wundt was promoted to professor of "Inductive Philosophy" in Zurich, and in 1875, Wundt was made professor of philosophy at the University of Leipzig where Ernst Heinrich Weber (1795–1878) and Gustav Theodor Fechner (1801–1887) had initiated research on sensory psychology and psychophysics – and where two centuries earlier Gottfried Wilhelm Leibniz had developed his philosophy and theoretical psychology, which strongly influenced Wundt's intellectual path. Wundt’s admiration for Ernst Heinrich Weber was clear from his memoirs where he proclaimed that Weber should be regarded as the father of experimental psychology. . “I would rather call Weber the father of experimental psychology…It was Weber’s great contribution to think of measuring psychic quantities and of showing the exact relationships between them, to be the first to understand this and carry it out.”