Michigan athletic director Dave Brandon has resigned, setting the stage for new leadership at the top of one of the nation's most prominent athletic departments.

Brandon's resignation comes amid a dismal football season and concerns over the school's handling of everything from its concussions protocol to student seating at games. Football coach Brady Hoke's future has been in doubt for months thanks to his team's lack of progress, but Brandon also became a target of disgruntled fans and students.

University President Mark Schlissel, who officially took over in September, said at a mid-October regents' meeting that he wanted to do an in-depth review of Michigan athletics. Displeasure with Brandon and Hoke was already mounting at that point, with the football team struggling and the department still being criticized for its handling of quarterback Shane Morris' head injury in a Sept. 27 game against Minnesota.