[2] Following two years pastoral work, Popowicz continued his studies in the Pontifical Oriental Institute in Rome to secure a Doctor of Canon Law degree.

Then, after short time of the professor work in the Theological Seminary in Lviv, Ukraine, he returned in Poland, where continued to serve in the different parishes.

[1] On 4 November 2013 Popowicz was appointed and on 21 December 2013 was consecrated to the Episcopate as the auxiliary bishop of the Ukrainian Catholic Archeparchy of Przemyśl–Warsaw.

The principal consecrator was Major Archbishop Sviatoslav Shevchuk, the head of the Ukrainian Greek Catholic Church.

[2] On 7 November 2015, after retirement of his predecessor, Archbishop Jan Martyniak, Popowicz was appointed and on 19 December 2015 was enthroned as the Metropolitan Archbishop of the Ukrainian Catholic Archeparchy of Przemyśl–Warsaw.