Tim Challies (BA, McMaster University) is a self-employed web designer and a pioneer in the Christian blogosphere, having one of the most widely read and recognized Christian blogs, Challies.com. He is also the editor of DiscerningReader.com, a site dedicated to offering thoughtful reviews of books that are of interest to Christians. Tim lives in Oakville, Ontario, with his wife, Aileen, and their three children.
John MacArthur is the pastor-teacher of Grace Community Church in Sun Valley, California, where he has served since 1969. He is known around the world for his verse-by-verse expository preaching and his pulpit ministry via his daily radio program, Grace to You. He has also written or edited nearly four hundred books and study guides. MacArthur is chancellor emeritus of the Master’s Seminary and Master’s University. He and his wife, Patricia, live in Southern California and have four grown children.