I heard an interview with the author on a favorite radio program and decided to buy the expensive audio book. I never got past chapter 8 because the previous 4 chapters were not only NOT about leadership but the attempt made by the author regarding evolutionary anthropology and hormones was not appealing to this reader. I probably could have endured it if there were some quotes from resources, and perhaps there are some in the footnotes of the paper copy; however, 4 chapters without quoted research left me wondering if the radio team ever actually read the book. To take it a step further, I think the author had a good outline and purpose for the book but he got lazy on the delivery. Just my 2 cents.