Jochen founded some open source projects like the portable branch of aserve, the compatibility layer acl-compat, the CLIM IRC Client WeirdIRC (which is the root of the IRC library cl-irc) and an E-Mail Library called mel-base.
As a freelance journalist he has written several articles about Common Lisp which got published in a German magazine for software developers (Toolbox).
His IRC Nick on Freenode's #lisp channel is "Neonsquare".