What is his/her education level?
What is his/her career?
Has he/she published other works?
Has he/she won any awards (especially for writing about or in relation to the topic)?
What is his/her point of view?
Another possible electronic resource is Amazon. Search the book in Amazon and look at the “Publisher’s Description” section of the entry for the book. This will often include brief information about the author.
You can also try finding author information on the following databases:
This video shows you how to look up the credentials of the author of a book.
Books are published by publishers, such as Random House or Penguin, or a university press such as the University of California Press.