Mark DeVries is pastor of youth and families at First Presbyterian Church in Nashville, Tennessee, where he has served for the past seventeen years. In addition to authoring several books, including Family-Based Youth Ministry and True Love Waits, he is founder of Youth Ministry Architects (www.ymarchitects.com), a strategic-planning service for churches facing transitions in their youth ministries. He and his wife, Susan, live in Nashville. Susan DeVries has made a career out of being a wife, mother, and supervising editor of every word Mark has ever written. Over the past twenty-three years, Susan has partnered with Mark in providing premarital counseling and leading marriage retreats and classes for couples. Mark and Susan have three children and live in middle Tennessee. Bobbie Wolgemuth is the author or co-author of several books including With Love from Mom, the four-book series Great Hymns of Our Faith, and Hymns for a Kid's Heart with Joni Eareckson Tada. The Wolgemuths have two married daughters, five grandchildren, and live in central Florida. Robert Wolgemuth is the owner and president of Wolgemuth & Associates, a literary agency. He has authored or co-authored sixteen books, including She Calls Me Daddy, the notes to The Devotional Bible for Dads, and Men of the Bible.