Henry Louis Le Châtelier, French chemist and academic (d. 1936)
Henry Louis Le Chatelier (French pronunciation: [ɑ̃ʁi lwi lə ʃɑtlje]; 8 October 1850 – 17 September 1936) was a French chemist of the late 19th and early 20th centuries. He devised Le Chatelier's principle, used by chemists and chemical engineers to predict the effect a changing condition has on a system in chemical equilibrium.