Apply Now
Answer God’s call to the priesthood—begin your journey today.
Apply
Forming priests after the Heart of Christ
Seminary Rector/ Professor
Mark Pivarunas entered the religious life in September of 1974. After a year’s postulancy, he entered the novitiate on September 8, 1975, taking the religious name of Brother Mary Tarcisius. He made his first profession of vows on September 12, 1976. Four years later, on the same feast day, he made his final profession of vows in the Congregation of Mary Immaculate Queen. Brother Tarcisius received the usual seminary training, displaying proficiency in philosophy and in dogmatic and moral theology. Having received the commendation of his superiors for his progress in both virtue and learning, he was ordained to the priesthood on June 27, 1985, by the Most Reverend George Musey. Father Tarcisius served as rector of the Congregation’s seminary for four years, and was then elected Superior General in 1989. His zeal for souls had led him to travel extensively throughout Nebraska and into neighboring states to provide the Mass and sacraments for the members of his flock. Since his elevation to the episcopacy by the Most Reverend Moises Carmona on September 24, 1991, Bishop Pivarunas has founded and operated Mater Dei Seminary at his parish in Omaha. His travels have necessarily become more extensive as he visits numerous parishes in the United States, Mexico, Canada and elsewhere to administer Confirmation and to ordain. Bishop Pivarunas has been an indefatigable worker toward unity among traditional Catholics in these times of confusion and error. Since his consecration, he has provided the Church with two bishops, numerous new priests, and has administered the sacrament of Confirmation to several thousand children and adults throughout the U.S., Mexico, Canada, New Zealand, South America, and Europe. He has indeed lived up to the motto he took for his episcopacy: Animam pro ovibus ponere (To lay down my life for the sheep). To go the extra mile for someone in need is his way of life; he knows no other.
Seminary Rector/ Professor
Vice- Rector/ Professor
Ordained to the priesthood in 2012, Fr. Carlos Borja has been a member of the faculty of Mater Dei Seminary for more than a decade. He teaches Dogmatic Theology, Liturgy, Latin, and Pastoral Theology, contributing to both the intellectual and spiritual formation of seminarians preparing for the priesthood. Father is the seminary organist and plays the organ accompanying the chanting of the Divine Office. In addition to his teaching responsibilities, Fr. Borja has been actively involved in pastoral ministry, having served parishes in Wisconsin, Colorado, Minnesota, and Florida. His experience in parish apostolate, combined with his commitment to sound doctrine and priestly formation, brings a practical and pastoral dimension to his instruction. Fr. Borja’s dedication to the Catholic faith and his long-standing service to the Church make him a valued and respected member of the seminary faculty.
Vice- Rector/ Professor
Dean of Students/ Professor
Fr. Stephen Sandquist completed his priestly studies at Mater Dei Seminary and was ordained to the priesthood on December 12, 2018. Shortly thereafter, he joined the seminary faculty, where he has since played an active role in the formation of future priests. Father teaches Ascetical theology, Latin, Liturgy, and Church History. In addition to his responsibilities at the seminary, Fr. Sandquist assists in parish and mission apostolates across the United States, bringing valuable pastoral experience to his work of priestly formation. He has served the faithful at several churches, including Our Lady of Fatima Chapel in Chelsea, Oklahoma, and Our Lady of Mount Carmel in Spencer, Oklahoma. As a dedicated instructor and overseer of the seminary’s daily operations, Fr. Sandquist contributes significantly to the spiritual, intellectual, and pastoral development of seminarians. His steady commitment and example of priestly virtue continue to inspire those preparing to serve God and His Church.
Dean of Students/ Professor
Latin Professor/Seminary Master of Ceremonies
Rev. Mr. Lucas Costa, originally from Brazil, is completing his final year of theological studies at Mater Dei Seminary. In addition to his studies, Rev. Mr. Oliveira serves on the seminary faculty, where he teaches Latin and assists in the liturgical life of the community. Known for his precision and thorough knowledge of the Church’s liturgy, he has often fulfilled the role of Master of Ceremonies at the seminary, ensuring the solemn and faithful observance of the Church’s rubrics.His instruction reflects his love for the Church’s sacred language and his deep understanding of the liturgy, which he imparts with clarity and devotion. He is scheduled to be ordained to the holy priesthood in May 2026, after which he will begin his priestly ministry in the service of souls and the propagation of the traditional Catholic Faith.
Latin Professor/Seminary Master of Ceremonies
Ecclesiastical Chant Professor/ Seminary Schola Director
Mr. Thomas Netzel is in his third year of theological studies at Mater Dei Seminary. Before entering the seminary, he was long active in the liturgical and musical life of his home parish, Mount St. Michael’s in Spokane, Washington. Drawing upon many years of experience in choral singing and the study of Gregorian chant, he now serves as professor of Ecclesiastical Chant and director of the seminary choir and schola. His deep appreciation for the Church’s sacred music is evident in his teaching and direction. Through his leadership of the schola, Mr. Netzel fosters in the seminarians a reverence for the beauty and solemnity of the Church’s liturgy, helping them to unite their voices and hearts in the praise of God according to the mind of the Church.
Ecclesiastical Chant Professor/ Seminary Schola Director
Answer God’s call to the priesthood—begin your journey today.
Apply
Stay connected to our mission—get the latest news and updates from Mater Dei Seminary.
Subscribe
Learn about our mission of forming faithful priests in the timeless traditions of the Catholic Church.
Learn More
Discover the path to priestly formation—explore our course of studies today.
Explore
Support the formation of future priests—help build the Church today.
Donate
Have questions? Reach out and connect with Mater Dei Seminary today.
Contact