Hank Jansen

Rumours spread by Coal Hill School students suggested that novels by Hank Jansen might be kept in the "library" that was the Staff Common Room, after having been confiscated. When Susan Foreman entered the Common Room, she found this to be false. (PROSE: Time and Relative)

Behind the scenes
In the real world, his surname is spelled Janson. Hank Janson is the pseudonym of Stephen Daniel Frances.