Geoffrey Parson

Geoffrey Parson was the headmaster at Coal Hill School in November 1963  and, by extension, Ian Chesterton and Barbara Wright's boss.

He was later brainwashed by the Master and ordered to fire Ian. (MOV: Doctor Who: Genesis)

At some point, the Imperial Daleks took control of him and used him as an undercover agent, implanting a thin device behind his ear. Upon meeting the Seventh Doctor, Parson assumed the Doctor came to apply for the job of school caretaker and wondered if he might not be overqualified, being a doctor. He later knocked out Ace and shut the Doctor in the basement with an Imperial Dalek, but was subsequently knocked out by Ace. He was exterminated by the Imperial Daleks. (DW: Remembrance of the Daleks)