John Piper is founder and lead teacher of [...] and chancellor of Bethlehem College & Seminary. He served for thirty-three years as the pastor of Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than fifty books, including Desiring God; Don't Waste Your Life; and Reading the Bible Supernaturally.

Justin Taylor (PhD, The Southern Baptist Theological Seminary) is the executive vice president of book publishing and book publisher at Crossway. He has edited and contributed to several books, including A God-Entranced Vision of All Things and Reclaiming the Center, and he blogs at Between Two Worlds--hosted by the Gospel Coalition.

David Powlison (1949-2019) was a teacher, a counselor, and the executive director of the Christian Counseling & Educational Foundation. He received his PhD from the University of Pennsylvania and was also the senior editor of the Journal of Biblical Counseling. He wrote a number of books, including How Does Sanctification Work?; Making All Things New; and God's Grace in Your Suffering.

Mark Dever (PhD, Cambridge University) is the senior pastor of Capitol Hill Baptist Church in Washington, DC, and president of 9Marks ([...]). Dever has authored over a dozen books and speaks at conferences nationwide.

Michael Lawrence (PhD, Cambridge University; MDiv, Gordon-Conwell Theological Seminary) serves as the lead pastor of Hinson Baptist Church in Portland, Oregon. He is the author of Biblical Theology in the Life of the Church.

C. J. Mahaney is the senior pastor of Sovereign Grace Church of Louisville. He has written, edited and contributed to numerous books, including Proclaiming a Cross-Centered Theology; Don't Waste Your Sports; and Sex, Romance, and the Glory of God. C. J. and his wife, Carolyn, are the parents of three married daughters and one son, and the happy grandparents to twelve grandchildren.

Carolyn McCulley is a speaker, filmmaker, and award-winning author. In 2009, she founded Citygate Films, where she works as a producer, director, and editor.

Carolyn Mahaney is a wife, mother, and homemaker. Having spent over thirty years as a pastor's wife, Carolyn has spoken to women in many churches and conferences. She is the author of Feminine Appeal, Girl Talk, Shopping for Time and True Beauty. She blogs with her daughters at [...], a blog focused on biblical womanhood. Carolyn and her husband, C. J., have four children and twelve grandchildren.