Carolyn Nystrom (MA, Wheaton College) has written more than eighty books, Bible study guides and children's titles. She served as general editor for the Christian Classics series and she co-authored Guard Us, Guide Us and Praying with theologian J. I. Packer, and Before I Was Born (God's Design for Sex) with Sandra Speidel. In addition to actively serving in her church and community, she has been a foster parent, an elementary schoolteacher and a book editor. Carolyn lives in the Chicago area with her husband and they have four grown children.

J. I. Packer is regarded as one of the most influential evangelicals in North America. He is Board of Governors' Professor of Theology at Regent College in Vancouver, British Columbia, and his writings include books such as Knowing God, A Quest for Godliness, Growing in Christ (Crossway) and Rediscovering Holiness. He has preached and lectured widely in Great Britain and North America and served as general editor of the English Standard Version of the Bible published in 2001, and theological editor of the Study Bible version. In 2014, Packer was named Author of the Year by the Association of Logos Bookstores. He is a frequent contributor to and an executive editor of Christianity Today and has written numerous articles published in journals such as Churchman, SouthWestern Journal, Reformation and Revival Journal and Touchstone. He received a BA, MA and PhD from Oxford University.