As far as I know, Horst Herrlich has some publications as Y.T. Rhineghost.
http://www.informatik.uni-bremen.de/~herrlich/public/index.html ([Wayback Machine](http://web.archive.org/web/20121113194607/http://www.informatik.uni-bremen.de/~herrlich/public/index.html))
http://www.csupomona.edu/~hlord/geist/ ([Wayback Machine](http://web.archive.org/web/20110607014623/http://www.csupomona.edu/~hlord/geist/))

I do not know the story behind this pseudonym.