Extremely friendly

I was walking around at a convention a couple years ago, and saw him just ambling around. Being the ridiculous fan of both ASoIaF and Wild Cards that I am, I of course approached him and started talking to him. We ended up standing there for ten minutes or so, just standing in the aisle between two booths chatting about his various projects. He has to get that kind of thing all the time (especially now that the TV show is so popular), but he was extremely friendly and seemed completely unhurried to end the conversation.