Ishchak was born in the city of Mykolayiv in the Lviv Oblast. He studied theology in Lviv and Innsbruck. He received his doctorate of theology from the University of Innsbruck in 1914 and was ordained to the priesthood. He taught at the Lviv Theological Academy from 1928, while serving as priest in the village of Sykhiv.
- ↑ 1.0 1.1 1.2 Biographies of twenty five Greek-Catholic Servants of God at the website of the Vatican
- ↑ 2.0 2.1 Beatification of the Servants of God on June 27, 2001 at the website of the Ukrainian Greek Catholic Church