I've learned that Robert Chassell died last weekend. http://www.ebb.org/bkuhn/blog/2017/07/03/Chassell.html
I did not know him myself, but he had a significant role in the early development of Texinfo, working on the first translator (in Emacs Lisp) to generate Info from Texinfo source, and also writing a lot of the manual. He was a director of the Free Software Foundation and served as its treasurer.
