Henri Louis Le Chatelier was a French chemist born on October 8, 1850. He is best known for formulating Le Chatelier's Principle, which explains how a system at equilibrium responds to changes in concentration, temperature, or pressure. This principle is fundamental in the field of chemical equilibrium and helps predict the direction of chemical reactions. Le Chatelier's work extended beyond chemistry; he also contributed to the fields of thermodynamics and metallurgy. His research laid the groundwork for advancements in industrial processes, particularly in the production of ammonia and other chemicals. Le Chatelier passed away on September 17, 1936.