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.

Anthony Bradley is Associate Professor of Theology and Ethics at The King’s College in New York City and serves as a Research Fellow at the Acton Institute.

Tim Keller (1950–2023) was an author, theologian, and apologist. He was the founding pastor of Redeemer Presbyterian Church in New York City, New York, and a co-founder of The Gospel Coalition.