The Rev. Hans August Leyst was born 30 June 1860 and died 17 January 1937 in Dorpat. He served the parish in Gnadenflur from 1890-1892 and in Simbirsk from 12 October 1893-1920.
- Schnurr, Joseph. Die Kirchen und das religiöse Leben der Russlanddeutschen - Evangelischer Teil (Stuttgart: Landsmannschaft der Deutschen aus Russland, 1978): 156.