Had a few email exchanges with the man himself. On randomness, on English grammar, on Swedish adventures in The Thirty Years' War, on certain politics (where we didn't necessarily see eye to eye but where there was plenty of room for civilised discussion). Unfailingly polite, informative, entertaining, and of course with cognitive ressources most of us can only dream of.
John Walker, thanks for all the effort and the inspiration. I shall miss your presence.