Mike Cosper is the director of the Harbor Institute for Faith and Culture, where he works to create resources for Christians living in a post-Christian world. Prior to that, he was a founding pastor at Sojourn Community Church in Louisville, Kentucky, where he served for sixteen years as the pastor of worship and arts. Timothy J. Keller (1950–2023) was the founding pastor of Redeemer Presbyterian Church in New York. He was the bestselling author of The Prodigal God and The Reason for God.  Collin Hansen (MDiv, Trinity Evangelical Divinity School) is the vice president for content and editor in chief for the Gospel Coalition and the executive director of the Keller Center for Cultural Apologetics. He hosts the Gospelbound podcast and wrote Timothy Keller: His Spiritual and Intellectual Formation. He is an adjunct professor and cochair of the advisory board at Beeson Divinity School in Birmingham, Alabama. You can follow him on X at @collinhansen. Timothy J. Keller (1950–2023) was the founding pastor of Redeemer Presbyterian Church in New York. He was the bestselling author of The Prodigal God and The Reason for God.