Jean‑Michel Courtault’s *Louis Bachelier – Aux origines de la finance mathématique* offers a scholarly overview of the life and work of Louis Bachelier, the pioneering mathematician whose 1900 dissertation laid the groundwork for modern quantitative finance. Drawing on archival material and contemporary commentary, the book traces Bachelier’s ideas from their early formulation in probability theory to their influence on today’s financial modeling and risk management. It situates his contributions within the broader historical context of early‑20th‑century economics and mathematics, highlighting the interdisciplinary bridges he built between theory and practice. Readers gain insight into how Bachelier’s concepts anticipated later developments such as stochastic calculus and option pricing, while also learning about the academic and institutional environments that shaped his research. The work serves both as a concise biography and as an accessible introduction to the mathematical foundations of finance.