Geoff Chang serves as an assistant professor of church history and historical theology and is also the curator of the Spurgeon Library at Midwestern Baptist Theological Seminary. You can follow him on Twitter at @geoffchang.
Jonathan (@JonathanLeeman) edits the 9Marks series of books as well as the 9Marks Journal. He is also the author of several books on the church. Since his call to ministry, Jonathan has earned a master of divinity from Southern Seminary and a Ph.D. in Ecclesiology from the University of Wales. He lives with his wife and four daughters in Cheverly, Maryland, where he is an elder at Cheverly Baptist Church.
Matt Smethurst is managing editor of The Gospel Coalition and author of Deacons: How They Serve and Strengthen the Church (Crossway, 2021), Before You Open Your Bible: Nine Heart Postures for Approaching God's Word (10Publishing, 2019), and Before You Share Your Faith: Five Ways to Be Evangelism Ready (10Publishing, 2022). He is now in the process of planting River City Baptist Church in Richmond, Virginia. You can find him on Twitter at @MattSmethurst.