About Us
As Lay Dominicans, also known as Third Order Dominicans, we live out our Christian vocation in the world, while striving to grow in the four pillars of Dominican spirituality: prayer, study, community, and apostolate. We seek to deepen our relationship with God through daily prayer and the study of Sacred Scripture, the teachings of the Church, and the writings of the great Dominican theologians and mystics.Our Mission & Vision
Our vision and mission is to help connect people to faith
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Mission & Purpose
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Our Team
Our Beliefs
Meeting Times
Upcoming Events
Frequently Asked
Become a Dominican
Our Beliefs & Values
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Prayer
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Study
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Community
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Apostolate
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Veritas
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“Curabitur aliquet quam id dui posuere blandit. Proin eget tortor risus. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Nulla quis lorem ut libero malesuada feugiat. Donec sollicitudin molestie malesuada. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. “
– Saint Thomas Aquinas, OP
Who We Are
Our Team & Leadership
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Mr. Cesar Vallejo, OP
Chapter President
Cesar has been married to his wife, Lori, for 33 years; they are blessed with two children and two grandchildren. They are members of St. Monica Parish in Edmond, OK. Cesar consecrated his life to Jesus through Mary following the method of the Third Order Dominican, St. Louis‑Marie de Montfort. His spiritual growth deepened further through the Spiritual Exercises of St. Ignatius of Loyola (Retreat in Daily Life).
His love for the Dominican Order began when he first encountered the writings of St. Thomas Aquinas, whose clarity of thought and pursuit of truth has shaped the way Cesar understands the faith and the world. That encounter eventually led him to make his permanent profession as a Lay Dominican in 2022.
Cesar is an Electronic Engineer with an MBA and works as a strategic alliances consultant. At St. Monica, he co-founded a men’s ministry program and led it for 11 years. He has served as a facilitator for the parish youth program, OCIA, and—together with Lori—has accompanied engaged couples through the marriage preparation program. He has led Exodus 90 retreats for several years and is a strong promoter of Eucharistic Adoration.
Together with other members of his Dominican chapter, Cesar studies and seeks to live the spirituality found in the writings of the Lay Dominican Servant of God Luisa Piccarreta, working to help bring about the reign of the Divine Will on earth as in heaven.

Mrs. Mary McClernon, OP
Chapter Vicepresident

Mrs. Teresa Tharp, OP
Treasurer

Fr. Jude Siciliano, OP
Spiritual Advisor

David Lassiter
Recruiting Coordinator

Kathy Shanon
Inquiry Formation

Catherine Vandiven
Candidacy Formation

Brett Farley
Retreat Coordinator
Our chapter’s Founder
John was born in Midlothian, TX on December 20th, 1958, to Julia and Joseph McClernon. Even as a little boy he started walking with Jesus and His mother Mary and would say a Hail Mary before hitting a homerun out of the ballpark. In college he attended a Charismatic prayer meeting and was profoundly touched by the Lord, and so began his lifelong love of Jesus.
John got his accounting degree and became a CPA. He moved to Dallas to establish residency to continue his education and get his master’s degree. His mother remembers praying to Padre Pio to stay with him throughout his life. When she entered the room John had stayed in and she was overcome with a strong scent of roses (a sign that Padre Pio would answer her prayer).
John joined the Community of God’s Delight in Dallas, a large Christian community that had a thriving young adult group, it was there that he met the other Mary in his life, the one destined to be his wife. On their first meeting they spoke about the reality of angels and when Mary walked away John thought “If I was a pioneer going across the country, that is the woman I would want at my side”. And so his adventure began, but John still felt the tug to give his heart to Jesus in the religious life and went to a monastery to discern a life as a monk. While there, he wondered if he would regret not marrying Mary and decided to put it in the Lord’s hands. He asked the Lord to guide him, opened the Bible, and randomly put his finger on Matthew 1:20 “…do not be afraid to take Mary as your wife…”
John and Mary were married on June 29, 1984. They had plans for Mary to work while John went to school for his master’s. John said to Mary one day “We have made these plans but have not asked the Lord what His plans would be in our lives. With that open door Mary conceived their first of five children, (Christopher, Clare, Catherine, David, and Stephen) who were the biggest gifts of his life.
John fulfilled his desire to have a religious vocation and became a Lay Dominican. He dedicated much of his free time to the Saints of the Church which resulted in 9 published books and 9 audio rosary productions.
He became an analyst for the Department of Justice. He loved his work and would end up staying with DOJ for the remainder of his life.
John was a wonderful and devoted father, husband, Dominican, and author. He always saw the best in people and loved his family throughout the many joys and sorrows of life. When John wasn’t working, he could be found at Church, at a family event, or watching Notre Dame football with his friends.

Mr. John McClernon, OP (1958-2023)
Mary Queen of Preachers Chapter Founder
F.A.Q.
Frequently Asked Questions
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