Simon was one of the first people I met in the Postgres community, perhaps in 2007 at the first PGCon that I attended. We've attended many of the same conferences in places around the world, and I've occasionally had the chance to explore those places with him. He was always kind to me and helped me immensely. I was proud to have the chance to co-author a major feature with him. The last time I saw him was this past December.
Very sad.