A life well lived
Like many here, I will remember John for his clarity of thought and precision with words. His vivid, simple, and accurate explanations of difficult concepts were often the last word on a subject.
He was touched by genius, but not at all by hubris. He used his knowledge and experience to inspire and educate rather than criticise and pontificate. I benefitted greatly from his encouragement and I would phone him with my most perplexing problems. A discussion with John on any subject was a pure joy.
A brilliant, accomplished, nice man.
Enjoy the view from your hover John.