Here is a pretty concise history of Mr. K and his work:
http://en.wikipedia.org/wiki/Tonio_KNone of his records in the 70s and 80s sold well, and all were out of print for some time (SEE UPDATE!), but he seems to have paid the rent co-writing hits for other artists. His own stuff tended to be punk-metal in sound with very sarcastic, humorous lyrics, like his "dance craze" song "Do the Funky Western Civilization":
You just - grab your partner by the hair
Throw her down and leave her there
Or from the infamous "H-A-T-R-E-D", featuring a live recording of an AK-47 which brought the cops running to the studio:
Oh I wish I was as mellow, as for instance, Jackson Browne
But - "fountain of sorrow" my arse mother@#$%er, I hope you wind up in the ground!
Or "La Bomba", which is the Ritchie Valens tune with a Spanish parody lyric about nuclear war.
UPDATE: See link below, looks like he bought his masters back and reissued them on CD himself, so now much of his vintage material is available again.