John Currie (DMin, Westminster Theological Seminary) is professor of pastoral theology at Westminster Theological Seminary, where he teaches preaching and leadership. As a pastor, he has led churches in Canada and the United States with a commitment to the priority of expository preaching. John lives near Philadelphia with his wife, Rhonda. They have two grown sons and eight grandchildren.

Sinclair B. Ferguson (PhD, University of Aberdeen) is Chancellor’s Professor of Systematic Theology at Reformed Theological Seminary and the former senior minister of the First Presbyterian Church in Columbia, South Carolina. He is the author of several books, including By Grace Alone and Lessons from the Upper Room. Sinclair and his wife, Dorothy, have four grown children.