Here are some other TeX activities I've been engaged in over the years. Here is an interview about my TeX activities.
In 2004 I taught a computer science topics course at the University of Tennessee based on topics in TeX and LaTeX. Here are the lecture notes, printed or freely downloadable.
Between 1990 and 2010 I was a contributing editor (bbeeton was the main editor) of Tugboat, the TeX users group journal. Here are some of my favourite writings.
Macros, mostly for LaTeX, that I’ve written over the years, hosted at CTAN, and possible included in TeX distributions.