Kazys Šimonis was born on August 25, 1887 in, near Kupiškis, northern Lithuania. He studied organ, was also interested in history and ethnography. In 1909-1911, he went to work for his brother in the United States. In 1911, he returned to Lithuania, and was called up for military service in the Imperial Russian Army. He painted and studied episodically: with Tadas Daugirdas, with local painters while serving in the army in Kiev, Fedosejevo evening drawing courses in Saint Petersburg. In 1919, he settled in Kaunas and actively participated in the Lithuanian cultural life. In 1919-1924, he taught drawing and penmanship at Kaunas Aušra high school and teacher training courses. In 1920-1921, he attended the private art school of Adomas Varnas. In 1923, he studied art in Berlin. In 1923-1924, he taught drawing at teacher courses organized by Juozas Damijonaitis. In 1926, he received a two-year grant to study in Paris from the Ministry of Education. In 1934-1945, he worked at the Kaunas School of Art as the library manager. In 1945-1950, he was director of the museum of the Kaunas Applied and Decorative Arts Institute. In 1951-1959, he worked as a technician at the architecture department of Kaunas Polytechnic Institute. He died at the age of 91, and was buried in Petrašiūnai Cemetery in Kaunas.
Šimonis created about 2,000 works of art – landscapes, portraits, fantasy paintings, as well as ex-libris, posters, proposals for postage stamps, decorative panels in Birštonas. He collected and painted folk art, architectural monuments. His individual exhibitions were held in 1925, 1926, 1927, 1929, 1949, 1958, 1967, 1972, 1977 in Kaunas, 1925 in Washington, D.C., Boston, Chicago, 1926 in Riga, 1927 in Klaipėda and Paris, 1968 and 1975 in Vilnius. He published his memoirs Gyvenimo nuotrupos in 1959. He developed his own interpretation of the prevailing artistic movements: cubism, expressionism, rayonism. In the early creative period, Šimonis was influenced by M. K. Čiurlionis. Later, when he learned of the Western European art, he was significantly influenced by German expressionist and Bauhausschool of art, and especially by Lyonel Feininger and his beams of light that were stylized, falling in many different directions, and forming fantastic images. When he lived in France, he was influenced by primitivism. His mature creative period started in mid 1920s and lasted the end of 1930s. During this period, his works exhibit the growing tendency to divide things and space into geometric segments. The artist paid particular attention to light which divided geometric segments into small crystals. After World War II, his creativity started to fade and he returned to earlier themes. Sadness and recollections start appearing in his stylized fantasy works. During this period, he created more realistic landscapes and scenes of nature. He was criticized for imitation. Notable works: "Foliage", "Towers", "Fantasy", "Thirst", "Forest Fire", "Princess", "Composition", "Lights", "In Fog", "Fantasy Landscape", "Candles", "Living Stones", "Landscape with Wayside Shrine", "Girl with Flowers", "Into The Space", "Breaking Morning". He also painted portraits of actors Ona Rymaitė, Unė Babickaitė, Teofilija Vaičiūnienė, writers Vydūnas, Vincas Mykolaitis-Putinas, Vincas Krėvė-Mickevičius, Juozas Tysliava, Liudas Gira, Kazys Binkis, historian Simonas Daukantas, artist M. K. Čiurlionis, and others.
