Bachelier, Louis

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Bachelier, Louis Gender: M
Louis Jean-Baptiste Alphonse Bachelier
born on 11 March 1870 at 04:00 (= 04:00 AM )
Place Le Havre, France, 49n30, 0e08
Timezone LMT m0e08 (is local mean time)
Data source
BC/BR in hand
Rodden Rating AA
Collector: Scholfield
Astrology data s_su.18.gif s_piscol.18.gif 20°24' s_mo.18.gif s_gemcol.18.gif 27°28 Asc.s_capcol.18.gif 18°35'

Louis Bachelier (aged 15)


French mathematician credited with being the first person to model the stochastic process now called Brownian motion, which was part of his PhD thesis, "The Theory of Speculation" ("Théorie de la spéculation," published 1900).

His thesis, which discussed the use of Brownian motion to evaluate stock options, is historically the first paper to use advanced mathematics in the study of finance. Thus, Bachelier is considered a pioneer in the study of financial mathematics and stochastic processes.

Defended on 29 March 1900 at the University of Paris, Bachelier's thesis was not well received because it attempted to apply mathematics to an unfamiliar area for mathematicians. However, his instructor, Henri Poincaré, is recorded as having given some positive feedback (though socially insufficient for finding an immediate teaching position in France at that time).

For several years following the successful defence of his thesis, Bachelier further developed the theory of diffusion processes, and was published in prestigious journals. In 1909 he became a "free professor" at the Sorbonne. In 1914, he published a book, Le Jeu, la Chance, et le Hasard (Games, Chance, and Randomness), that sold over six thousand copies. With the support of the Council of the University of Paris, Bachelier was given a permanent professorship at the Sorbonne, but World War I intervened and Bachelier was drafted into the French army as a private.

His army service ended on 31 December 1918. In 1919, he found a position as an assistant professor in Besançon, replacing a regular professor on leave. He married Augustine Jeanne Maillot in September 1920 but was soon widowed. When the professor returned in 1922, Bachelier replaced another professor at Dijon. He moved to Rennes in 1925, but was finally awarded a permanent professorship in 1927 at the University of Besançon, where he worked for 10 years until his retirement.

He died on 28 April 1946, aged 76, in Saint-Servan-sur-Mer, France.

Link to Wikipedia biography


  • (has as) teacher relationship with Poincaré, Henri (born 29 April 1854). Notes: Doctoral advisor


  • Relationship : Marriage 14 September 1920 (Augustine Jeanne Maillot)
    chart Placidus Equal_H.

Source Notes

Sy Scholfield provided birth certificate (acte n° 537) from the online Seine-Maritime archives. Marriage and death data in margin.


  • Family : Relationship : Number of Marriages (One)
  • Vocation : Education : Teacher
  • Vocation : Military : Military service (Army)
  • Vocation : Science : Mathematics/ Statistics
  • Vocation : Writers : Textbook/ Non-fiction