Jules Regnault
Economist
Jules Augustin Frédéric Regnault was a French stock broker's assistant who first suggested a modern theory of stock price changes in Calcul des Chances et Philosophie de la Bourse, using a random walk model. Wikipedia
Born: February 1, 1834, Béthencourt, France
Died: December 9, 1894 (age 60 years), Paris, France