I'll go 2009 to date.
Kelley, Kennedy, Armacost. (Schafer was interim.)
NDSU?
Chapman, Bresciani, Cook. (Hanson was interim.)
But NDSU does lead 1-0 on "email deletion investigations of the president by the NDAG" in that timeframe. (And yes "bison audit", it seems the AG's office used that as a "learning experience" in not a good way.)