Ernst Heinrich Weber was a German physician and psychologist, born on June 24, 1795, in Würzburg, Germany. He is best known for his work in the field of sensory perception and is often regarded as one of the founders of psychophysics. Weber's most notable contribution is the Weber-Fechner Law, which describes the relationship between the magnitude of a stimulus and the perception of that stimulus. Weber's research focused on how humans perceive changes in stimuli, such as weight and sound. He introduced the concept of the just noticeable difference (JND), which quantifies the smallest change in a stimulus that can be detected. His work laid the groundwork for future studies in psychology and sensory research.