John Piper is founder and teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. For 33 years, he served as pastor of Bethlehem Baptist Church, Minneapolis, Minnesota. He is author of more than 50 books, including Desiring God: Meditations of a Christian Hedonist and most recently Foundations for Lifelong Learning: Education in Serious Joy.

Erroll Hulse was born in South Africa in 1931. He served as a manager of the Banner of Truth Trust, and later as a pastor.

Greg Livingstone is senior associate for missions advancement of World Outreach for the Evangelical Presbyterian Church.

David Powlison served as the Executive Director at Christian Counseling & Educational Foundation and edited The Journal of Biblical Counseling.

Tom Steller is serving through Training Leaders International as the Director of Theological Education in Cameroon. He continues to serve as an elder at Bethlehem Baptist Church.