Born in what is present-day Belarus, Deyneka immigrated to Chicago in 1914, where he worked in a machine shop.

Reared in the Russian Orthodox Church and briefly claiming to be an atheist, Deyneka was converted to evangelical Christianity in 1920 under the ministry of Paul Rader at Moody Memorial Church.

[2] Deyneka married Vera Demidovich on May 23, 1926, before working in Latvia and Estonia as field secretary for the All-Russian Evangelical Union and then engaging in a number of preaching tours to the worldwide Russian diaspora.

[5] In 1975, he retired as general director of the Slavic Gospel Association and was succeeded by his son, Peter Deyneka Jr.

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