A good partner is like a great whiskey: You don't mind spending a lot of time together, but you can't stand the sight of it at 9AM.
Truth is I can collaborate and create things with just about anyone, but in case you're looking for a highly efficient, responsible and reliable team, here are a few Creative Director-level art directors whom I know well. (Also, if you're just looking for a really good AD, grab one of these people.)
Lisa Lloyd www.lisalloydcreative.com
Paul Safsel www.paulsafsel.com
Chris Cole www.chriscolecreative.com
Mark Schruntek www.markschruntek.com