Tim Challies, a self-employed web designer, is a pioneer in the Christian blogosphere, having one of the most widely read and recognized Christian blogs. He is also editor of Discerning Reader, a site dedicated to offering thoughtful reviews of books that are of interest to Christians.
John MacArthur has served as the pastor of Grace Community Church in Sun Valley, California, since 1969. He is known for his verse-by-verse expository preaching, and his pulpit ministry has extended around the world via his daily radio program, Grace to You. He has also written or edited nearly four hundred books and study guides. MacArthur serves as the president of The Master’s College and Seminary, a four-year liberal arts Christian college. He and his wife, Patricia, live in Southern California and have four grown children.