I know but he only spent one year with the 49'ers as their OC. I believe he was hired, as the Packers HC, for all his so-called accomplishments he did with the Saints.
He's a coaching tree candidate, supposedly a WCO guru. I don't like McCarthy enough to look him up, but I have heard so much about his history with WCO greats, and McCarthy's great offensive mind. I agree that he has a pretty awesome playbook, he just shouldn't be allowed in the stadium on gameday.
I do know that he wasn't fired by the Saints, his contract ran out and he was instructed to wear civvies to the senior bowl. (you know, that's where out of work coaches shop thier resume's)