The Rev. Karl Zimmer, son of joiner Johannes Zimmer, was born 7 January 1863 in Mirau (Kurland). He married Julia Amalie Nilsson on 15 September 1892 in the Crimea. She was born 31 July 1870 in Pernau and died 4 September 1921 in Baku (Caucasus). Pastor Zimmer died on 19 October 1939 in Rohr b. Stuttgart (Germany).
He studied theology at the Basel Mission and was ordained on 10 July 1890 [some sources: 13 July 1890] in Ludwigsburg. He served the following congregations in Russia:
Elisabethtal (Caucasus) (1892-1904)
Baku (Caucasus) (July - December 1921)
Annenfeld (Caucasus) (1921-1923)
Alexeyevka (Caucasus) (1923-1925)
In 1925, he moved to Germany and settled in Baden. He served various parishes in southwest Germany until his death in 1939.
Pastor Karl Zimmer is the father of The Rev. Wilhelm Zimmer.