Dr. Walls, Dr. Baggett’s co-author of some of the books already mentioned, is one of the world’s leading thinkers on issues of heaven, hell, and purgatory, having written a book on each and a forthcoming book covering all three. He’s written voluminously, from a book on the apologetics of Schaeffer and Lewis, a critique of Calvinism, two books on basketball, and more besides. Currently, Dr. Walls is a professor at Houston Baptist University in Houston, TX.