Albiron Mattingdom served as Headmaster of Hogwarts School of Witchcraft and Wizardry from 1846 to 1848. He was the first Headmaster to fall under the regulation of the Board of Governors, rather then the Foundation.
Mattingdom, despite being quite a capable administrator, found himself regularly clashing with the Board of Governors over matters of policy. He resigned out of frustration in 1848. The Board of Governors appointed Donnell Bixby as his successor.