He was ordained deacon on 5 November 1899 and priest on 12 November 1899 by Bishop Konstantyn Chekhovych for his native Eparchy,[2] after completed his studies. He continued to study in the University of Lviv and University of Vienna with Doctor of Canon Law degree in 1903.[1] Mastsiukh was a professor of the Canon Law in the Theological Seminary in Przemyśl and in the University of Lviv from 1903 until 1920, with the some interruption, when he was detained in the Thalerhof internment camp during the World War I. Following next fourteen years, from 1920 until 1934, he made a pastoral work for the Greek-Catholic parish in Horożanna Wielka.[1]
On 17 November 1934, Fr. Mastsiukh was appointed by Pope Pius XI the first Apostolic Administrator of the new created Apostolic Administration of Lemkowszczyzna (that later was elevated in the rank of Apostolic Exarchate) without dignity of bishop.[2]
He died unexpectedly at his residence in Rymanów-Zdrój on 12 March 1936 at the age of 62.
References
^ abcБлажейовський, Дмитро (1996). Ієрархія Київської Церкви (861—1996) (in Ukrainian). Львів: Каменяр. p. 324.
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