Stephen Hales was the first to measure blood pressure directly in the horse (1733), and the definitive studies on human nephrins by Richard Bright followed much later (1836). The relation between high blood pressure and renal disease was established by Mahomed (1872). The discovery of renin and its possible link with Bright's disease was made by Tigerstedt and Bergman (1898), but only the experimental production of renal hypertension by Goldblatt and his colleagues (1934) led to the delineation of the role of the kidney in human hypertension by a wide variety of methods.