Nathan P. Butler has produced several of his own fandom audio dramas since 2002. However, he has also been a voice actor for other, original audio drama productions.
Butler portrayed various characters, including a lead character, in three of Jeff Roney's RoneyZone Media original audio dramas.
You can find all three on the RoneyZone Media website.
Shadow of the Stars: Savus
Nathan P. Butler plays a major role as a Yoda-esque mentor character in the upcoming Shadow of the Stars: Savus audio drama from Grail Quest Books, based on the book series of the same series name by K.M. Strid.
You can find the project on the Grail Quest Books website.