Does krakauer have an acceptable background to speak with authority on this subject? Why or Why not?

Book: Into the wild

Yes, Krakauer has an acceptable background to speak with authority on this subject.

Krakauer has an acceptable background to speak on the subject because he has scores of outdoor experience; throughout the book, he makes mention of his climbing adventures throughout the book. In fact, written a number of books and articles about his outdoor experiences (e. g. Into Thin Air). Other than that, he knows quite a number of outdoor experts. Furthermore, Krakauer seems to understand Chris McCandless because of his own experiences with his father.