J. I. Packer (1926-2020) is regarded as one of the most well-known theologians of our time. Once named to Time magazine's list of the 25 Most Influential Evangelicals in America, Packer served as Board of Governors' Professor of Theologyat Regent College in Vancouver, British Columbia. His books include Knowing God, Praying, A Quest for Godliness, Evangelism and the Sovereignty of God, and Rediscovering Holiness.

Gavin Ortlund (PhD, Fuller Theological Seminary) is senior pastor at First Baptist Church of Ojai in Ojai, California. He was previously a research fellow for the Creation Project at the Carl F. H. Henry Center for Theological Understanding at Trinity Evangelical Divinity School. He is the author of Finding the Right Hills to Die On, Theological Retrieval for Evangelicals, and Anselm's Pursuit of Joy.