Ah, shoot :( That's such a shame! (that they died, not that they didn't ever get to use HTTPS).
At least there is no cert which expire. And no authority to obey.
Pieter was my best friend, a great loss.
But his writings are here to stay, i guess he started to write some books after 2009, when he got his first duct bill cancer.
His book The Psychopath Code helped me tremendously. I remember also reading some other books from him. Good stuff, food for thought. A great loss indeed.