Does he have a server in mind for this already? Or would hardware need to be a part of the solution? I have experience setting up, configuring, and maintaining a MediaWiki. Not sure about what kind of listserv he wants, but I'm sure I could scare something up.

Contact me at:

your_first_name at MavelousWebDesign dotcom

Yours, Mr. R. I've set you up in my system, so things'll get sent to the proper folder in my mail client. :)