What is the author's style in Stiff: The Curious Lives of Human Cadavers by Mary Roach?

Stiff is written in both the first and third person, as well as both the past and present tense. When writing in the first person, Roach appears as a character. When writing this way, Roach uses the present tense almost exclusively. This lends the text both intimacy and immediacy. In these sections, the author is very "present" and the text reads as a traditional narrative, with the author telling the story of where she went, what she saw there, and to whom she spoke.