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"He has loved Michigan since working there earlier in his career," Ravens coach John Harbaugh said in a statement. "We will miss him because he's a great coach, but also an even better person. The students there are the lucky ones. Not only will he teach them football to the highest level, he will influence them to be the best persons they can be. Greg is one of the good people you are fortunate to meet in your life. We are disappointed that he will not be coaching our defense, but we know that he is following a true love by returning to the Wolverines."
Greg Mattison has been the Baltimore Ravens defensive coordinator the past two seasons. He'll take the same job at Michigan.