Ross Trottier attended CU Boulder as a Classical Guitar Performance Major under the virtuoso Jonathan Leathewood, where he received the highest marks for theoretical studies. He currently resides in Colorado Springs, where he teaches and performs full time.
It started off well, but I soon got lost. With a lot of effort sometimes I could make sense of something by re-reading it over and over, but eventually I just gave up. Although given how many good reviews this book has, perhaps I'm just a lost cause for music theory.
I found the book a good way to go deeper but I started with you tube videos from the same source. The purchase of the book was more to support the creator.
And one of the things I learned is that I still have a lot to learn! Somewhere in the midst of chord inversions I got a bit confused, but I recovered in the circle of fifths and key signatures. Practice is definitely necessary in order to fully absorb this material but I feel the book was written well and provided a solid base for my curious mind!