Francis "Frank" Armitage (TV: Nightvisiting, Co-Owner of a Lonely Heart) was headteacher at Coal Hill School, (TV: Into the Dalek) later Coal Hill Academy (TV: For Tonight We Might Die) as early as 19 July 2013 (TV: Nightvisiting) up until his death on 27 October 2016. (PROSE: What She Does Next Will Astound You)
By 2013, Armitage was aware of the Doctor, and knew he was an alien, as the school's governor, Ian Chesterton, was an old friend of his. The Eleventh Doctor was surprised that Armitage knew of him and his time machine. (PROSE: The Day of the Doctor)
He introduced Clara Oswald to Danny Pink. (TV: Into the Dalek) During a meeting, he also introduced the staff to the school's new temporary caretaker, "John Smith", who was actually the Twelfth Doctor working undercover. He was present at parents' evening, and told Mr Woods and Mrs Woods that Clara should be back in a few minutes, after she had run off with Danny. (TV: The Caretaker)
Shortly after Danny Pink's death, he informed the students and staff of the school about the death and also mentioned how their sympathy must also be expressed to Clara, who many knew had a relationship with the late maths teacher. (TV: Dark Water)
As head teacher in 2016, Mr Armitage oversaw renovations to Coal Hill, including the construction of the Barbara Wright Building. At the start of the new term, he put April MacLean in charge of decorating the gymnasium for the Autumn Prom.
A week later, on 27 October 2016, he interviewed Victoria Prim for a job at Coal Hill. The afternoon after the interview, (PROSE: What She Does Next Will Astound You) he was skinned alive and subsequently killed by a skin-peeling dragon. (TV: The Coach with the Dragon Tattoo)