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, Minnesota. He is author of more than 50 books, including Desiring God: Meditations of a Christian Hedonist and most recently Come, Lord Jesus.

Mark Dever is a pastor at Capitol Hill Baptist Church in Washington, D.C., the president of 9Marks (a ministry for churches and church leaders), and the author of many books, including Nine Marks of a Healthy Church. He and his wife, Connie, have two children.

Ligon Duncan is Chancellor, CEO, and John E. Richards Professor of Systematic and Historical Theology of Reformed Theological Seminary.

C.J. Mahaney is the senior pastor of Sovereign Grace Church of Louisville. He also writes at his personal website.

Albert Mohler serves as president of The Southern Baptist Theological Seminary in Louisville, Kentucky.