It appears Bruce Arians has added yet another member to his coaching staff.
Coach Z headed to Arizona as assistant oline coach & will be working with Harold Goodwin and Bruce Arians who he coached with in Pittsburgh— Lance Zierlein (@LanceZierlein) January 29, 2013
Lance Zierlein, who broke the news, is Larry Zierlein's son. So it stands to reason this report is fairly accurate.
As for the elder Zierlein, he spent time as Pittsburgh's offensive line coach from 2007-2009, and before that was with the Buffalo Bills and Cleveland Browns in a similar capacity.