May his memory be a blessing.
For a really beautiful hesped about Brown, see this inspiring post from his colleague at Rivendell bikes. Here's a few words from it:
…whatever Sheldon was interested in he became expert at. But unlike many experts who flaunt it and use it to make those who knew less feel stupid, Sheldon was a humble educator. Is there anything better to be? I think there isn't. Is there anybody who has helped more people, solved more problems, and contributed more enthusiasm and knowledge about bikes to more people?