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 Keller is the lead pastor of Redeemer Presbyterian Church Lincoln Square and also the longest-tenured senior pastor in the Redeemer network of churches in New York City. He has spent two decades engaging with one of the world’s most culturally diverse populations. He holds a PhD from Vrije Universiteit Amsterdam and MDiv and ThM degrees from Gordon-Conwell Theological Seminary. His writings have been featured in publications such as Christianity Today, The Gospel Coalition, ByFaith magazine, and Gospel in Life.