Gustav Theodor Fechner was a German philosopher, physicist, and psychologist who made significant contributions to the fields of theoretical perception and psychophysics. Synonyms for Gustav Theodor Fechner may include "the father of psychophysics," "a pioneer of experimental psychology," and "a mathematical psychologist." Fechner is also known for his concept of the "Fechner scale," which is used in many fields to measure the intensity of a stimulus. As a scholar, he influenced a generation of thinkers and remains an important figure in the history of psychology. Despite the passage of time, Fechner's work continues to have relevance today in both psychological research and philosophical discourse.