Timothy S. Lane, MDiv, DMin, is a minister in the Presbyterian Church in America (PCA) with over 30 years of experience in pastoral ministry, counseling, teaching, and executive leadership. He is the author of several minibooks and the coauthor of the books How People Change and Relationships: A Mess Worth Making and the curricula Change and Your Relationships, How People Change, and Instruments in the Redeemer's Hands. Tim speaks internationally, consults with churches, and writes about the importance of pastoral care.

Paul David Tripp, MDiv, DMin, is the president of Paul David Tripp Ministries, a nonprofit organization whose mission is to connect the transforming power of Jesus Christ to everyday life. Paul is a best-selling author of many books on Christian living, including How People Change, Instruments in the Redeemer's Hands, A Quest for More, Relationships: A Mess Worth Making, Parenting: 14 Gospel Principles That Can Radically Change Your Family, and New Morning Mercies: A Daily Gospel Devotional. He has been married for many years to Luella, and they have four grown children.

David Powlison, MDiv, PhD, (1949-2019) was a teacher, counselor, and the executive director of the Christian Counseling & Educational Foundation (CCEF). He wrote many books and minibooks, including Speaking Truth in Love, Seeing with New Eyes, The Biblical Counseling Movement: History and Context, Good and Angry: Redeeming Anger, Irritation, Complaining, and Bitterness, Making All Things New: Restoring Joy to the Sexually Broken, God's Grace in Your Suffering, and Safe and Sound. David was also the editor of The Journal of Biblical Counseling.