If you don't know, he was the keyboardist of Velvet Underground. However, he also put out a bunch of solo records in the art-rock/proto punk vein. He was also very much involved in the downtown ambient scene, working with LaMonte Young a lot with drone music. If you haven't heard him, I recommend checking out the album Paris 1919. http://www.allmusic.com/cg/amg.dll?p=amg&sql=A4qotk6rx9krg A link to the album: http://www.sendspace.com/file/9cngtq
Heh, Paris 1919 is the only album of his I have, great release, I should bother myself to dig out some other things out of his discography.