Bishop Mazur was born into a family of ethnically Ukrainian Greek Catholics in Brazil. After attending a minor Basilian seminary, he joined the Order of Saint Basil the Great, where he had a profession on February 10, 1981 and a solemn profession on January 1, 1988. Mazur was ordained as a priest on September 8, 1990, after studies at the St. Basil's Seminary-Studium in Curitiba. He continued his studies in Italy in the Pontifical Atheneum of St. Anselm, graduating with a baccalaureate in Sacred Theology and with a licentiate in Educational Sciences from the Salesian Pontifical University.[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]
