I'd second this. It really is a phenomenal book. For me, the most interesting thing about it is it would probably be a terrible meditation guide for a lot of people I know. But if you have the approach/learning style that's typical of folks on hacker news, it's the best book there is--because of its emphasis on clearly elucidated concepts, consistent use of language and terms, ample neuroscience-oriented background, and an "actionable" progressive approach.
For me, its key feature was that I found it more actionable than other sources that I'd found online. I prefer it to 'Mindfulness in Plain English'. However, to be fair, I haven't read the entire text, so I don't think that I can make a fair comparison.
Edit: The author of the book is Culadasa (Dr. John Yates, PhD), whose profile mentions that he was a neuroscience professor at one point in his life. I haven't verified this.
