Dear category-theorists, Many of you will be aware that over the years I have kept a record of all talks given at meetings of the Peripatetic Seminar on Sheaves and Logic. I promised to make this publicly available on the occasion of the hundredth meeting; and it has now been uploaded to the website, at https://www.dpmms.cam.ac.uk/~jg352/PSSL100/pssl100.html Information on each talk is given in the form Date; start time; speaker; current affiliation; title. For reasons of space, when I started keeping the list (typed out in hard copy in those days!) I omitted finishing times (so you have to work out for yourself where the coffee-breaks came) and co-authors of joint work. By the time I went over to using TeX it was too late to reconstruct this information for the earlier meetings, so I continued to omit it. There are a number of gaps in the list (mostly missing titles or affiliations); if anyone can help to fill in some of those gaps, or correct any mistakes (of which I'm sure there are many), please e-mail ptj@dpmms.cam.ac.uk. Peter Johnstone [For admin and other information see: http://www.mta.ca/~cat-dist/ ]