A few years ago I wrote up the story[0] of how I not only met, but became first colleagues, then friends. He was absolutely lovely. Phenomenal mathematician, wonderful juggler, and a lovely person to be around.

We didn't meet often, but I'm sad to think I won't see him again. I'll miss him.

[0] https://www.solipsys.co.uk/new/MeetingRonGraham.html?tg07hn