They say still waters run deep. This isn't always the case, but in the case of Zach Paul it's an understatement. At the same time, you won't get to the bottom by trying—let this list of his favorites serve as an introduction, instead. And lest you underestimate the importance of young Mr. Paul, know that Exodus Books would cease to run without his quiet efforts.
Not only is he the strong, silent type, he has incredible powers of concentration. Ironically, he'll tell you that he can't focus on anything longer than a few minutes, but he's managed to make most of the images you'll find on the Exodus Books website, an incredibly long and often bitter task for which he receives little credit.
More importantly, Zach wants more than anything to serve the Lord Jesus Christ in faithfulness and truth. You might not find a lot of books in his "Favorite Christian Materials" section, but the Bible is the most important book in his library, and the only one he could never do without out. He's a good guy, and you should pay attention to him.