What is the author's tone in Stones Into Schools: Promoting Peace with Education in Afghanistan and Pakistan by Greg Mortenson?

The book is written in a relaxed tone that is often comical. The author tells his story with charm and insight, giving the reader a sense of the danger the CAI workers face in Afghanistan without becoming so serious the reader feels bogged down in dark emotions. In fact, the author goes as far as to admit highly personal information in order to show the reader that he does not take himself too seriously despite the deep passion with which he takes on his philanthropic acts.