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.
Philippe Pinel
Philippe Pinel (; 20 April 1745 – 25 October 1826) was a French physician who was instrumental in the development of a more humane psychological approach to the custody and care of psychiatric patients, referred to today as moral therapy. He also made notable contributions to the classification of mental disorders and has been described by some as "the father of modern psychiatry". An 1809 description of a case that Pinel recorded in the second edition of his textbook on insanity is regarded as the earliest evidence for the existence of the form of mental disorder known as dementia praecox or schizophrenia in the 20th century by some although Emil Kraepelin is generally accredited with its first conceptualisation.