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Our Staff

David A. Harrell, PhD

Dr. Harrell is currently the senior pastor-teacher of Calvary Bible Church where he has served since 1994. His Bible expositions are heard and read regularly around the world over the Internet and broadcasted over the radio. He is also the President of Olive Tree Christian Resources (www.otcr.org) which serves as the media arm of Calvary Bible Church, committed to the creation and distribution of Christian books, expository sermons, Internet and radio programming, websites for doctrinally sound evangelical churches, pastoral training, and church planting (America, Africa, Siberia). After attending the Moody Bible Institute, he graduated from Grace College, Grace Theological Seminary, and the Oxford Graduate School where he earned the Doctor of Philosophy degree in Social Research Methods, which focuses on the Sociological Integration of Religion and Society. He is a former Associate Professor of Biblical Counseling at the Master’s College, Santa Clarita, CA. He is married to Nancy and together they have three children and five grandchildren.


Joe Miller, DMin / ACBC Certified Biblical Counselor

Joe is passionate about expositing the Word of God and is committed to personal soul care through discipleship, biblical counseling, and evangelism, both locally and globally. The Lord has blessed Joe with a godly wife Tara, who is also trained and passionate about providing soul care to God’s people. Both Joe and Tara have been privileged in proclaiming the Gospel of Jesus Christ in seventeen countries around the world. They are strong advocates of the sufficiency of Scripture in changing lives – “All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work” (2 Tim 3:16-17 ESV ). Joe received a B.S. from the University of California, Los Angeles; his M.Div. from The Master's Seminary in Los Angeles, CA, and a Doctorate in Biblical Counseling from the Southern Baptist Theological Seminary, in Louisville, KY. He is also certified as a biblical counselor by Association of Certified Biblical Counselors (ACBC). Joe has been blessed with four children, Huntington, Dakota, Skye and Liberty, and two Bernese Mountain Dogs.


Tara Miller, MFCC

Tara was "born again" by God's grace in 1995 after she could not unearth any lasting hope for change from her Masters degree at the University of Southern California, in Marriage, Family and Child Counseling. Despite her training and years helping others, she turned to the Bible and found lasting help and hope. Ever since, from the overflow of her heart, she has been sharing the gospel of Christ Jesus and the transforming truths from the scriptures with other women and children. She married Joe in 1997 and committed herself to ministering alongside him in local churches around the world and raising children in the fear and admonition of the Lord (Eph 6:4).  Tara is in the process of completing her certification in counseling with the Association of Certified Biblical Counselors (ACBC). She has been blessed with four children whom she is homeschooling. Alongside her husband Joe, by the grace of God, they are laboring together to instruct their chidlren in the transforming Gospel truths (John 3:3-5; Rom 8:28-29; Rom 12:2; 2 Cor 3:18; Heb 12:23; 1 Peter 1:14-16; 2 Peter 3:18), as well as the fear and admonition of the Lord Jesus Christ (Eph 6:4).