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St. Mary's Seminary & University

Dr. Dennis Castillo

Associate Dean of Assessment & Accreditation
Professor of Systematic Theology

B.A., Michigan State University
M.A., Ph.D., Divinity School of the University of Chicago

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Dr. Dennis Castillo joined the St. Mary’s faculty in 2022 after more than twenty years of teaching at other Catholic colleges and seminaries. He serves also as St. Mary’s Associate Dean of Assessment and Accreditation. About teaching his discipline, Dr. Castillo says, “In my approach to Church History, I like the image St. Augustine uses in The City of God, seeing the Christian person as being in the world, but not of world. Church History is the story of the Holy Spirit inspiring the Christian community on its pilgrimage from this world to the next. In doing so, we do not ignore the world, but rather are called to preach the Good News and aid those in need. In this journey of faith, there are many challenges and temptations. Church History is a very valuable discipline for those preparing to serve the people of God, helping us to learn from past mistakes and identifying good role models in ministry.

Dr. Castillo enjoys all periods of Church History, seeing in each one the challenge of being a disciple of Jesus to a world in need of the Gospel. His own research has been in the fields of American Catholicism and the history of Malta. Dr. Castillo has two current writing projects. One is a history of the Catholic Church’s response to the cholera epidemics in the nineteenth century. The other is a study of the Knights of Malta and the order’s transition in the twentieth century from being a military order back to its original hospitaller charism.

Selected Courses Taught

  • Ancient and Medieval Christianity
  • Modern and Contemporary Christianity
  • American Catholicism
  • Catholicism and World Religions
  • Religion in the United States

Service to the Church

  • Director of Religious Education
  • RCIA Coordinator
  • Ministry Formation for Catholic Healthcare

Selected Publications

  • A Catechist’s Guide to the Early Church (Twenty-Third Publications, 2005)
  • The Maltese Cross: A Strategic History of Malta (Greenwood, 2006)
  • Edited The Life and Times of John Timon: The First Bishop of Buffalo, the work of the late Leonard Riforgiato (Edwin Mellen Press, 2006)
  • For the Spread of the Kingdom: A History of Christ the King Seminary, 1857-2007 (Café Press, 2008)
  • The Santa Marija Convoy: Faith and Endurance in War-Time Malta, 1940-42 (Lexington Books, 2012)
  • Papal Diplomacy from 1914 to 1989: The Seventy-Five Years War (Lexington Books, 2020)

Recommended Reading

  • The Didache
  • St. Augustine, The City of God
  • Thomas of Celano, The Life of Francis
  • St. Francis De Sales, Introduction to the Devout Life
  • Pope Leo XIII, Rerum Novarum

A Favorite Quotation

“You have made us for Yourself, O Lord, and our hearts are restless until they rest in You.” — St. Augustine, Confessions, Book I, Chapter I