Émile Michel Hyacinthe Lemoine (November 22, 1840 – February 21, 1912) was a French civil engineer and a mathematician, a
geometer in particular. He was educated at a variety of institutions, including the Prytanée National Militaire and, most
notably, the École Polytechnique. Lemoine taught as a private tutor for a short period after his graduation from the latter
school. Lemoine is best known for his proof of the existence of the Lemoine point (or the symmedian point) of a triangle.
