What is the author's tone in The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest For' by Brian Greene?

The book is very conversational, almost as if the reader is attending a lecture given by Brian Greene. It is obvious that Greene is an expert on the subject matter, but he works to make his knowledge accessible for his less-equipped audience. The book is geared toward people without an intimate understanding of physical and mathematical theory and processes, and Greene's conversational tone enhances the feel of being in a lecture hall.