Jerry Bridges (1929-2016) served for over sixty years on the staff of the Navigators. He authored fifteen books and five devotionals, including The Pursuit of Holiness, which has sold over a million copies. Bob Bevington (OD, Ohio State University) served as an optometrist for two decades while simultaneously cofounding several entrepreneurial start-up companies, including a LASIK provider with eighteen locations. He is a writer, editor, and the coauthor (with Jerry Bridges) of Bookends of the Christian Life. 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, the most recent being By Grace Alone: How the Grace of God Amazes Me. Sinclair and his wife, Dorothy, have four grown children.