Teacher
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A teacher was an individual who was well versed in a subject and made money by teaching others, typically children or young adults.[source needed] The Doctor has encountered numerous teachers in his travels.
Two of the First Doctor's first companions were teachers. Ian Chesterton and Barbara Wright, who taught Susan, followed Susan to a junk yard when worried for her safety and quickly became caught up in the Doctor's travels. (TV: An Unearthly Child)
The Second Doctor, Jamie, and Zoe, when visiting Dulkis, met Balan, a teacher and researcher of the residual radioactivity from a blast that happened 172 year prior. (TV: The Dominators)
The Third Doctor befriended Bernard Helmann, a philosophy teacher at Oxford, at the 1960 Campaign for Nuclear Disarmament. (PROSE: Come Friendly Bombs...)
The Seventh Doctor and Ace met Miríl, a teacher on Kirith, and uncovered the truth about the planet's history with him. (PROSE: Timewyrm: Apocalypse)
The Tenth Doctor posed as and met many teachers while investigating Deffry Vale High School with Rose, Mickey, and Sarah Jane. (TV: School Reunion)
The Tenth Doctor became the human teacher John Smith at the Farringham School for Boys for a short time when traveling with Martha. (TV: Human Nature/Family of Blood)
Clara Oswald, companion of the Eleventh Doctor, became a teacher at Coal Hill School after the events on Trenzalore. (TV: Day of the Doctor)
