Does anybody know Rob Seegel (aka RCS), the author/maintainer of Tk::MListbox?

I tried to contact the author by e-mail but didn't get any feedback so far.
I would like to adopt the module Tk::MListbox (and the other packages).

Does anybody know Brent B. Powers, the author of (amongst others) Tk::FileDialog and Tk::Waitbox?

I tried to contact the author my e-mail but every address I tried returned an error like undeliverable or unknown user etc.