For reference the author is Bob Nystrom: http://www.stuffwithstuff.com/bob-nystrom.html , user 'munificent' on HN: https://news.ycombinator.com/user?id=munificent not that it should matter who he is.

Since I'm talking about him I'll say I think his Game Programming Patterns book is great: http://gameprogrammingpatterns.com