Ilya Mikhailovich Lifshitz (Russian: Илья Михайлович Лифшиц, January 13, 1917 – October 23, 1982) was a leading Soviet theoretical physicist of a Jewish origin, brother of Evgeny Lifshitz. He is known for his works in solid state physics, electron theory of metals, disordered systems, and the theory of polymers.Together with Arnold M.