Dear colleagues, I met Bill only relatively recently at ct99 in Coimbra, so, for instance, I never saw him bringing up his political views in a public mathematical discussion, but I have witnessed many times his generosity and efforts to give deep and honest advice to colleagues of all ages, in that peculiar way of his which was both self confident and yet devoid of arrogance. He was also very patient. I have very fond memories of our conversations during ct meetings, at the Bristol seminar he organized , at the México workshops organized by Quico, and also in Arcadia with Fatima and Silvana. Motivated by Bill’s interest on o-minimal structures we once attended an important summer school on Model Theory. When the organizers realized Bill was there they made a public announcement celebrating his presence and invited him to chair a session. We Category Theorists were indeed privileged to share an epoch, or part of one, with Bill’s profound intellect. His results will influence our subject for many years. Still, I would like to encourage younger generations to continue studying his work, including his messages to this list, where they will find a treasure of remarkable brightness, full of fascinating ideas still to be pursued. Yours, Matías [For admin and other information see: http://www.mta.ca/~cat-dist/ ]