Callahan's son Brian took the head coaching job for the Titans a couple of weeks ago, and now his father will be joining his staff.
Callahan has been the Brown's offensive line coach for the last four seasons and had the Brown's offensive line as one of the best units in football over those years.
Callahan was able to help improve and turn right guard Wyatt Teller into a Pro Bowler and did a great job with rookie right tackle Dawand Jones this past season.
The Browns losing Callahan is a massive blow, considering he is hands down one the best offensive line coaches in the NFL.
It's awesome he can coach with his son, and I wish all the best for Bill and Brian in Tennessee.
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