Ask Aaron: Michigan coaching staff, Zach Charbonnet, transfer targets Updated Jan 22, 2021; Posted Jan 22, 2021 Michigan running back Zach Charbonnet (24) and teammates huddle to pray before their Big Ten football game against Wisconsin at Michigan Stadium in Ann Arbor, on Saturday, November 14, 2020. (Mike Mulholland | MLive.com)Mike Mulholland | MLive.com Facebook Share When Jim Harbaugh said last Friday that he was close to making hires, he wasn’t kidding. In the span of just over 72 hours, Michigan announced the addition of Mike Macdonald as new defensive coordinator, Maurice Linguist as co-defensive coordinator and defensive backs coach, and George Helow as safeties coach.