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.
Gottfried Fischer
Gottfried Fischer (13 September 1944 – 2 October 2013) was a German psychologist, psychotherapist and psychoanalyst. He is considered to be the founder of psychotraumatology in Germany and has been director of the Institute for Clinical Psychology and Psychological Diagnostics at the University of Cologne from 1995 to 2009.