I wasn't familiar with this dudes body of work so I just got done looking it up a bit. He has been the DC at Michigan for the last few years. Before that he was the DC for the Baltimore Ravens and has been a LB and DL coach at different levels of football. I was curious why we would want a DC from a school where the HC was fired. Well, here it is. Michigan did not suck this year because they had ****ty defense. In fact, during Mattison's tenure as DC at Michigan, they have been a top 20 defense most years, and some years a top 10 in total defense. He's a good DC, but he's old. Wouldn't be a bad hire from a scheme and technique perspective.