August Siebengar, son of Peter Siebengar, was born in Kamenka on 12 June 1888. He started medical school in 1909 at Kazan University, transfering to Saratov State University from which he graduated in 1914. He worked in a number of medical clinics and hospitals among the Volga German colonies, particularly in Balzer. From 1934 to 1938, he served as the head of the Second City Hospital in Engels.
In 1931, he became involved in politics. On 19 June 1938, he was arrested by the NKVD, tried for subversive activities, and sentenced to death. He was executed on 27 October 1938 in Saratov.