Kazimir Severinovich Malevich (Russian: Казимир Северинович Малевич, Belarusian: Казімір Малевіч, Polish: Kazimierz Malewicz, Ukrainian Казимір Северинович Малевич, German: Kasimir Malewitsch), (February 23, 1878 – May 15, 1935) was a Ukrainian and Russian painter and art theoretician of Polish descendance, pioneer of geometric abstract art and one of the most important members of the Russian avant-garde and Suprematist movement.