You can tell who my friends are: check out the nice 5-star reviews on Amazon.
Reviewer Jordan Cohen is referenced in the book as probably the first to show a big improvement in speech recognition performance by moving to a more auditory front-end, at IBM in the 80s (after he turned down my job offer that he alludes to in his review).
Reviewer Lloyd Watts did a lot of great work on cochlear modeling, as a grad student at Caltech, and later founded Audience to apply those ideas to valuable machine hearing problems such as noise suppression in mobile phones; I reference a number of his results, and use one of his figures. Thanks, guys!
Of course, big thanks also to friends Roy Patterson, Bill Yost, and Dan Levitin, who wrote the "advance praise" blurbs on the back cover, and who have encouraged this line of work for decades.
More reviews, wherever you got the book, are good for me, for the field, and for the market. Thanks, readers!