Justin Richards (in-universe)

Justin Richards was a writer and alientologist who wrote the book The Secret Lives of Monsters, which exposed the alien activity on Earth that had long been covered up by governments and organisations like Torchwood and UNIT. He brought together evidence that had been hidden for centuries to reveal the truth about aliens. The book consisted largely of previously classified documents compiled and published for the first time by Richards with the help of whistleblowers and journalists, including James Stevens and Benjamin Nevis. (PROSE: The Secret Lives of Monsters)

In the about the authors page in Summer Falls and Other Stories (anthology), Justin Richards is listed as an in-universe author."Mr Justin Richards is a noted author of fictional fantasies concerning the continuing exploits of a mysterious traveller in space and time known only as ‘the Doctor’. He has also chronicled the fantastical events of the Victorian era in his novels The Death Collector, The Parliament of Blood and The Chamber of Shadows."

Behind the scenes
The alientologist Justin Richards shares his name with Justin Richards, the real-world author of The Secret Lives of Monsters and the writer of many other Doctor Who prose and audio works.