The athletic director of the University of Michigan resigned today, the university's president announced at a press conference Friday. The midseason departure of an athletic director is unusual, but David Brandon has been at the center of several controversies during Michigan’s football season this year. The biggest: the team’s handling of a concussed quarterback in September. Shane Morris appeared to have a head injury but was sent back in to play against Minnesota. University President Mark Sclissel criticized the decision afterward, calling out Brandon but not Coach Brady Hoke. Morris was subsequently diagnosed with a concussion.