Timothy J. Keller (1950–2023) was the founding pastor of Redeemer Presbyterian Church in New York City, cofounder of Redeemer City to City, and the author of numerous books, including The Reason for God, The Prodigal God, and The Meaning of Marriage. His thirty-one books have sold over six million copies and have been translated into twenty-nine languages.

Michael S. Horton (PhD) is the J. Gresham Machen Professor of Systematic Theology and Apologetics at Westminster Seminary California, founder and editor-in-chief of Sola Media, and host of the White Horse Inn, a weekly roundtable podcast on theology and culture. He is the author of more than thirty books, including Justification: Volumes 1 and 2 in Zondervan Academic’s New Studies in Dogmatics and The Christian Faith: A Systematic Theology for Pilgrims on the Way.