John Piper is founder and teacher of desiringGod.org, and chancellor of Bethlehem College & Seminary. For 33 years, he served as pastor of Bethlehem Baptist Church, Minneapolis. You can find him on Twitter at @JohnPiper.
Matt Schmucker was the founding executive director of 9Marks. He now organizes several conferences, including Together for the Gospel and CROSS, while serving as member of Capitol Hill Baptist Church in Washington, D.C.