Louis Bachelier, French mathematician and theorist (died 1946)

Louis Jean-Baptiste Alphonse Bachelier was a French mathematician at the turn of the 20th century. He is credited with being the first person to model the stochastic process now called Brownian motion, as part of his doctoral thesis The Theory of Speculation.

March 11 is the 70th day of the year in the Gregorian calendar; 295 days remain until the end of the year.