A number of times I have had questions about who coached what position at Michigan, and I have seen others on here with similar questions. Because of that, I have put together the beginnings of a spreadsheet giving a year by year look at who coached various position groups. I say beginnings because there are a number of blank spots, and I haven't even attempted to figure out who coached what before 1969. My hope is that this can be improved on by others and potentially, even added to the site (e.g. similar to the editable depth chart) if the format works, and it's deemed worthy. Here is a link to the google doc:
I have gathered this information from MGoBlue.com, Wikipedia, Rivals, various coaches' profile pages, and old media guides. There is also this somewhat helpful resource on MGoBlue that lists the coaches year by year, but fails to finish the job by including their respective positions.
A Note on Formatting
This process got a little dicey when it came to the offensive line, defensive line, and linebackers. Often the coaching responsibilities for the various parts of these positions are divided. In some cases, I found two coaches listed for the same position, but no indication of who coached what portion of that position. Because more information is needed, I listed both coaches at both positions with a "/" between them. For example, in 1991 both Offensive Tackles and Interior Offensive Line are listed with Les Miles/Jerry Hanlon.
In other cases, I found evidence that a coach was only in charge of one aspect of a position. For example, Bob Chmiel coached the Inside Linebackers from 1981-84, but I never found anything about who coached the Outside Linebackers from that time.
Finally, if a coach was listed as the "linebackers coach" I put his name in both categories.
The Special Teams coach can get really confusing. For 2006, I found evidence that the position was handled by at least three different coaches. Until there is better information, I have elected to leave that blank. However, this might be more common than I realize, and maybe that position should also be broken up into more distinct categories.
I was hoping for a few anecdotes to add here, but everything I came across was pretty straight forward. The most interesting thing I found was how in years gone by it seemed more common for coaches to switch from one side of the ball to the other. Gary Moeller is a prime example.
He came with Bo in 1969 and coached the defensive ends. He then moved up to defensive coordinator in 1973 before becoming the head coach at Illinois. He came back to Michigan in 1980 as the quarterbacks coach, and then again became the defensive coordinator in 1982. After five seasons in that position, he moved back to the offensive side of the ball as coordinator for three seasons, and from what I understand, retained that position even after he became head coach in 1990.
I think like players, coaches have become more specialized over the years. We would probably all be shocked if Mattison retired, and Borges was named the new defensive coordinator. I suspect that the further back you go, coaches stuck to one side of the ball less often, and the lines become more blurred between who coached what position.
I welcome all updates, additions, or corrections to this file.