Impact Authors


Hal Warren (Impact Blog Coordinator)


Hal has been teaching the Bible for over three decades. Through an interdenominational ministry dedicated to helping the local church build men for Jesus, Hal trained men, the leaders of men’s ministries, and provided pulpit supply. Before that, he was a Men’s Ministry Leader and an Adult Bible Fellowship teacher of a seventy-five-member class at a denominational megachurch. Presently, Hal desires to honor Jesus Christ through this Internet teaching ministry, thereby glorifying the Heavenly Father, in the power and presence of the Holy Spirit.

Hal is a Professional Engineer, holding an MBA from Liberty University and a Ph.D. in Engineering. He is in his second career as an adjunct professor at a large research university. In his first career, He served six years honorably in the USN Nuclear Power Program, followed by a distinguished 36-year career in the commercial nuclear energy field. 

Hal and his wife have five adult children, several grandchildren, and with more grandchildren on the way! He believes, second to cultivating his relationship with God, that raising his family unto the Lord is the most significant task for him while on Earth. Furthermore, Hal believes that being a successful leader in the church or workplace is no substitute for failing to be a successful leader at home.

Topical Index to Hal’s Blogs 
Dan T. Lioy

Professor Dan Lioy (PhD, North-West University) holds several faculty appointments. He is the Senior Research Manager at South African Theological Seminary (in South Africa). Also, he is a professor of biblical theology at the Institute of Lutheran Theology (in South Dakota). Moreover, he is a dissertation advisor in the Leadership and Global Perspectives DMIN program at Portland Seminary (part of George Fox University in Oregon). Finally, he is a professor in the School of Continuing Theological Studies at North-West University (in South Africa). Professor Lioy is active in local church ministry, being dual rostered with the Evangelical Church Alliance and the North American Lutheran Church. He is widely published, including a number of academic monographs, peer-reviewed journal articles, and church resource products.
David Austin

David is passionate about becoming spiritually mature and helping the Church to be successful in Disciple-Making. He is interested in moving to an “Open Source” ministry model; recruiting and teaming with others who are passionate about empowering people to be eternally successful in Christ’s Kingdom and to see the body of Christ grow spiritually within the context of the local church across all languages and cultures worldwide.
Bill Lawrence


Bill Lawrence is the President of Leader Formation International, Senior Professor Emeritus of Pastoral Ministries and Adjunct Professor of DMin Studies at Dallas Theological Seminary where he served full-time for more than twenty-three years (1981-2004). During this time he also served as the Executive Director of the Center for Christian Leadership for twelve years. Bill is the author of two books: Beyond the Bottom Line: Where Faith and Business Meet (Moody Press) and Effective Pastoring (Word Publishing).

Bill served twelve years as founding pastor of South Hills Community Church, San Jose, CA (1969 to 1981). He has also served as Interim Pastor of Northwest Bible Church, Dallas, TX, on two different occasions.

Throughout the past thirty-seven years, Dr. Lawrence has ministered in more than thirty nations. His focus is on the transformation of the hearts of leaders who are impacting the nations. Since founding Leader Formation International in 2002, Bill has spoken at conferences, led seminars, conducted workshops, and mentored leaders in Asia, Central Asia, Europe, Latin America, and Africa. His goal is to engage the participants in their formation as leaders by leading them to see God’s hand in their formation and encouraging them to integrate their character with their competencies. Much of his ministry has occurred in closed countries where church leadership is just emerging.

He has been married to Lynna for over 40 years and they have three married sons and several grandchildren.
Stephen J. Drain

Stephen J Drain

“Rescued, ransomed, and saved because of the love of God the Father, through the regeneration of the Spirit of God thanks to faithful preachers and teachers of the Word, because of the perfect life and merit of Jesus the Messiah, His substitutionary death and His physical resurrection from the dead. Undeserved. Undeserved. Undeserved.” Steve would label himself an apprentice Christ-follower, an Evangelical Christian with strong Reformed beliefs, a “Five Point Calvinist”. Steve loves discussing and debating the two “taboo” subjects: Politics and Religion. He tries to read and listen to a minimum of forty books a year and realizes that no matter what topic or genre, whether Bible, theology, Christianity, history, biography, philosophy, political, social commentary, pop-culture, or even fiction, they all tie together in the spider’s web of worldview. His favorite author is C.S. Lewis, James R. White, J. Budziszewski, G.K. Chesterton, and Peter Kreeft. He loves Charles Haddon Spurgeon and Dwight L. Moody. Steve’s hobbies are generally reading and writing, music, hiking, and laughing. He has been writing songs/lyrics since the age of about eight and has played in a few Christian bands. He has written poetry, several biblical studies over the past decades, and has even finished his first book manuscript entitled, “Shaken Faith: When God Has Let You Down” with friend and co-author Al Rossi. He has also written for the now-defunct Examiner website as the Philadelphia Christian Perspectives Examiner. He wishes he could write some fiction.