Or if not, does anyone know how to reach the author? I may have missed it, but I didn't even see the author's name anywhere on the site.
with the help of mathjax: https://www.mathjax.org/
The font seems to be Georgia.
font-family: charter, Georgia, serif;
Another free font based on (and largely identical to?) Charter is Charis: https://software.sil.org/charis/
Or if not, does anyone know how to reach the author? I may have missed it, but I didn't even see the author's name anywhere on the site.