What is the author's style in Emerson: The Mind on Fire: A Biography by Robert D. Richardson?

As this is a biography, the author is the narrator of Emerson's life. Much research on Emerson's life has been done by Richardson to make this story engaging and true. Due to the fact this is a biography, more than likely R. W. Emerson has had some impact on Richardson, which could lead one to believe that he could very well have a biased opinion of the Emerson.