Tried Googling "mackay site:news.ycombinator.com" and found a lot of times where this book has been mentioned; I didn't see anything that clearly said "I am Dav

Tried Googling "mackay site:news.ycombinator.com" and found a lot of times where this book has been mentioned; I didn't see anything that clearly said "I am David Mackay" but that might be a good start. (You'll also find the occasional reference to Charles Mackay's book Extraordinary Popular Delusions and the Madness of Crowds.)