Bishop Mazur was born into a family of ethnically Ukrainian Greek Catholics in Brazil.

[1] After returning from Italy, he had various pastoral assignments and served as a professor, a superior and a rector at the Basilian Institutes in Brazil.

During 2004-2005 he was a Protohegumen (Provincial Superior) of the Basilians in Brazil[1] On December 21, 2005 Fr.

Mazur was nominated by Pope Benedict XVI and on February 26, 2006 consecrated to the Episcopate as an auxiliary bishop.

The principal consecrator was Cardinal Lubomyr Husar, the Head of the Ukrainian Greek Catholic Church.