What is the author's tone in Titan: The Life of John D. Rockefeller, Sr by Ron Chernow?

The tone of the book is objective. Chernow presents the facts without making moral or charitable judgments of John D. Rockefeller, as so many others have and this is not easy to do with a man like Rockefeller and the tactics of Standard Oil during the latter part of the nineteenth century. Chernow presents the facts as they are and leaves the reader to draw his own conclusions.