The Reason Why Author:Mark Mittelberg Almost a hundred years ago, succesful business leader Robert A. Laidlaw wrote a mall book, The Reason Why, to explain in a thoughtful and accessible way why he was convinced that faith in God makes sense. he printed the book primarily for his large staff of employees, but it quickly took on a life of its own-and over time fifty million copies w... more »ere printed of his powerful and winsome work.