Librarian

A librarian was someone who worked in a library. Some people held the title senior librarian.

History
In 1887, Jehosephat Ambrose was the head librarian at the Library of St John the Beheaded. (PROSE: All-Consuming Fire, AUDIO: All-Consuming Fire)

By 2050, Yssaringintinka was an Ukkan librarian. (TV: Lost Library of Ukko)

In 2079, Gemma Corwyn identified Zoe Heriot as the librarian aboard Space Station W3. (TV: The Wheel in Space)

In 2109, the Tractite Partil worked as a librarian planet Paratractis, in an alternate timeline where humanity never evolved on Earth. (PROSE: Genocide)

In 5150, a Head Librarian served at the Library. (TV: Silence in the Library)

Undated events
Prior to 2005, a Librarian worked in the British Library. Ms Millicent Davies was the senior librarian at the York Central Library. Both librarians caught the Ninth Doctor defacing books. (PROSE: Have You Seen This Man?)

Shardovan was librarian for the dwellings of Castrovalva. (TV: Castrovalva)

Edmund was a librarian for the Bodleian library in Oxford. (PROSE: Losing Track of Time)

Dr Armbruister was the senior librarian on the Braxiatel Collection. (PROSE: Sex Secrets of the Robot Replicants)

Other realities
In the Unbound Universe, the Doctor knew Mao Tse-Tung in his days as a librarian. (AUDIO: Sympathy for the Devil)