I first encountered David G. Hartwell at worldcons most likely in Winnipeg in 1994 where I saw him hosting the TOR party in an aloha shirt or a kimono leading the party guests in a rendition of Teen Angel.
David was one of the elder statesmen of science fiction, founding the World Fantasy Convention, starting the New York Review of Science Fiction among other feats.
Later he and his family began attending my local convention ConFusion and I got to know them on a more personal basis. We had a good few quick chats and he was always warm and friendly to me. I also got to host he and Kathryn Cramer his wife as ConFusion Fan Guests of Honour. A unique honour for them but then he was a unique person as is Kathryn.
one of the other highlights of our relationship was when I got to interview him at the 2010 World Fantasy Convention in Columbus.
He will be greatly missed.