He served as a Titular Bishop of Nazianzus and Auxiliary Bishop of Eparchy of Santa María del Patrocinio en Buenos Aires from 23 June 1990 until 20 January 1998; Apostolic Administrator the same Eparchy from 20 January 1998 until 24 April 1999; and as the Eparchial Bishop of Santa María del Patrocinio en Buenos Aires from 24 April 1999 until his retirement on 10 April 2010.
After the attending of the Orionine Fathers minor seminary in Buenos Aires, Mykycey subsequently joined the Sons of Divine Providence, where he had a profession on February 12, 1954, and a solemn profession on February 11, 1961.
[2] After returning from Italy, he served as teacher and subsequently director of the Don Orione Institute in Presidencia Roque Sáenz Peña and in the same time made a pastoral work for the Ukrainian Greek-Catholics in the Northern Argentina.
Mykycej was nominated by Pope John Paul II and on October 14, 1990 consecrated to the Episcopate as an auxiliary bishop.
The principal consecrator was Andrés Sapelak, the first bishop for Ukrainian Greek-Catholics in Argentina.