Ernst Weber was a German physician and psychologist, born in 1795 and known for his contributions to the field of psychophysics. He is best recognized for formulating Weber's Law, which describes the relationship between the magnitude of a stimulus and the smallest detectable change in that stimulus. This principle laid the groundwork for understanding sensory perception. Weber's work significantly influenced later psychologists, including Gustav Fechner, who expanded on his ideas. Weber's research focused on how humans perceive differences in weight, sound, and other sensory inputs, helping to establish a scientific approach to studying human perception and behavior.