klark0 - 9:33 pm on Sep 4, 2012 (gmt 0)
From a goolgler:
At the moment, only a "person" (eg Google Profile) can be an author
He said "at the moment" several months ago, but from what I can tell ..it's still true.
With rel=publisher the company is already taking credit for the article (and the whole site). Authorship let's you credit the person that works for or is affiliated with the publisher. So they are similar but different and can be used together.