Augusts Kirhenšteins was born on 18 September, 1872 on the estate of Valtenberg Manor in Mazsalaca, in the Governorate of Livonia. He was the eldest son of the tenant Martins Kirhenšteins and his wife Baba, in a family of eleven children. Augusts Kirhenšteins' brother Rudolf Kirhenšteins, went on to become a Soviet intelligence officer who was arrested and shot during the Great Terror. In 1888, Augusts Kirhenšteins attended school at the Riga Alexander Boys Gymnasium. He then studied at the Tartu Veterinary Institute, publishing his first scientific work while still pursuing his studies. He joined the student fraternity Selonija, later switching to the fraternity Zemgalija. In 1901, he graduated from the institute and worked as a veterinarian in Valmiera and Limbaži. After the 1905 revolution in Latvia, Kirhenšteins emigrated to Switzerland, where he lived for a while in Zurich. In 1911, he began work inDavos at the Institute for Tuberculosis Research as an assistant to the bacteriologist Carl Spengler. During World War I, Kirhenšteins served in the Serbian army as a military veterinarian. He returned home to Latvia in 1917, becoming a captain in the Latvian National Armed Forces. In 1919, he was elected as an associate professor at the University of Latvia, where he established a Microbiology Institute in the Faculty of Agriculture. In 1923, he defended his doctoral thesis, "On the Internal Structure and Development of Bacteria", writing his dissertation in French—this was the first doctoral thesis defended in Latvia. In 1923, he established a serological laboratory at the University of Latvia. Working as its director, he made a major contribution to the development of science in Latvia, especially in the fields of microbiology, immunology, dairy farming and biotechnology. In 1934, he married Olga Janson in Bern. In addition to his scientific activities, Kirhenšteins was involved in social and political matters, in which he was a supporter of social democracy. After the occupation of Latvia, Kirhenšteins was invited to the USSR embassy and offered to become the head of the Soviet 'puppet government' in Latvia, whose task was to ask Latvia to be admitted to the Soviet Union. He was then made chairman of the Presidium of the Latvian Soviet Socialist Republic, and vice-president of the Latvian Academy of Sciences. He died on 3 November, 1963 in Riga and was buried at Rainis Cemetery.
