Portrait of a bearded man holding a book

Quan Tum was a portrait that hung at the Lower Chambers Portrait Corridor next to a portrait of an old man at Hogwarts School of Witchcraft and Wizardry during the 1993–1994 school year.

Behind the scenes

 * It is sure that this is his name because there is a little split between the word quan and tum.

Etymology
His name is taken from the word quantum.

Appearances

 * Harry Potter and the Prisoner of Azkaban (film)