Hi! Thanks for stopping by. Unfortunately, you must have followed a broken link or typed an URL wrong. If you got here using a link on this very site, please let me know.
The website has been reorganized a few times. The entire site moved from ucalgary.ca/~zach/ to ucalgary.ca/rzach/ (no tilde). The blog moved from ucalgary.ca/~rzach/logblog/ to ucalgary.ca/rzach/blog/, but has since moved again. The blog is now at richardzach.org. PDFs that used to be in ucalgary.ca/~rzach/papers/ are now in ucalgary.ca/~rzach/static/. If that doesn't help you find what you need, go to ucalgary.ca/rzach/papers/ and look from there.
Otherwise your best bet is to go to the homepage, or use the search function in the navigation bar on the left.