James Bible Study
1 John Bible Study
Sermon on the Mount
Hebrews Bible Study
Online Teachings
Topical Resources by:
Cathy Deddo
Gary Deddo
Cathy's Reflections

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Cathy's New Book

The Letter of James Bible Study Guide by Cathy Deddo

Available for Purchase James Study Guide

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God, the Bible and the Shack. By Gary and Cathy Deddo
Available for Purchase
Supplement Download:
Question & Answer objections to the Shack
These studies look at the overwhelming goodness of the Triune God. Depicted by Andrei Rublev's icon of The Holy Trinity.

Trinity Study Center...Who We Are!

Cathy Deddo is the author of the Bible Studies and Reflections on this site. She is a Bible teacher, speaker and retreat leader. She and Gary, her husband, have three adult children, Linda, Gregory, and Krista.

Cathy received biblical and theological training from Fuller Theological Seminary and received an MA degree in theology. Cathy’s full-time ministry began as a campus staff member doing inter-denominational ministry for Inter-Varsity Christian Fellowship with university students first at the University of Virginia and then at the Claremont Colleges in So. California. She has taught the Bible for a wide variety of age groups and in many different contexts: neighborhoods, churches, retreats and conferences and on university campuses. She and her husband have hosted home fellowship groups for most of the 30 years of their marriage. Cathy has led leadership training seminars for small groups and for leadership development in the church context. She has been the guest speaker at numerous retreats on topics ranging from the Message of James to Building Loving Relationships and Learning to Worship the Triune God. She and Gary have also served as co-speakers at retreats.

She is presently a member of a Presbyterian Church (EPC) in the western suburbs of Illinois. She teaches 2 weekly women’s Bible studies, writes, and speaks when she can.

Contact Cathy about Teaching, Seminars and Writing through her email: cathy@trinitystudycenter.com

What Cathy says about her ministry...

Gary W. Deddo serves with Grace Communion International as assistant to the president and theological advisor to the denomination. Go to www.gci.org for more information. Gary received his initial and formal biblical and theological training from Fuller Theological Seminary receiving a Master of Divinity degree. He served as a campus minister with Inter-Varsity Christian Fellowship for 20 years before becoming an editor at Inter-Varsity Press. He continued his theological studies at Kings College of the University of Aberdeen, Scotland under the direction of Rev. Prof. James B. Torrance and was awarded a Ph.D. degree in systematic theology. His doctoral research was revised and published as a book; Karl Barth's Theology of Relations: Trinitarian, Christological and Human (Peter Lang, 1996).

Gary was ordained to his ministry with Inter-Varsity Christian Fellowship by the PCUSA in the San Gabriel Presbytery. He served for thirteen years as senior editor of academic books at InterVarsity Press USA before moving to serve with Grace Communion International. He is a founding board member of the Thomas F. Torrance Theological Fellowship.

Gary teaches courses in theology for Fuller, Wheaton College, and Grace Communion Seminary. And Gary has been a speaker at numerous retreats, conferences and seminars in both the university and church contexts. He has also been involved in leadership development of elders, small group and Bible study leaders.

Dr. Deddo has written a number of journal articles and has contributed chapters in several theological works. He and his wife, Cathy, have co-authored a book on the writings of George MacDonald and a booklet, titled "God, the Bible and The Shack."  

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