Terry Nation (in-universe)

Terry Nation was an individual who owned the patent for the Daleks. (COMIC:  Dalek Invasion of Earth 2150 B.C.) He also was one of the Preliminary Operatives who worked for the Daleks. (PROSE: The Dalek Invasion of Toyshops) Additionally, Terry Nation also existed in a parallel universe where the Doctor's life was solely fictional. (COMIC: The Girl Who Loved Doctor Who)

Biography
Terry Nation was present during the Daleks' first invasion of Earth in 2150 B.C. - there, he patented the rights to the Daleks' appearance before their other invasions. He even claimed that the Sixth Doctor owed him money for simply mentioning the Daleks. (COMIC:  Dalek Invasion of Earth 2150 B.C.)

Later, Nation was working for the Daleks as one of their Preliminary Operatives during their infiltration of Earth's popular culture during the 20th and 21st centuries. (PROSE: The Dalek Invasion of Toyshops)

Notably, there was a Time Lord Castellan called Terrynate who recieved a distress call by the Third Doctor. (PROSE: The Time Lord Letters)

Parallel universes
Terry Nation also existed in a parallel universe, where, like the Terry Nation of the Doctor's universe, owned the patent to the Daleks. (COMIC: The Girl Who Loved Doctor Who)

Behind the scenes
This is an in-universe version of Terry Nation, the man who is famous among the Doctor Who franchise as the man who created the Daleks. He was seen in COMIC: Early Man: Dalek Invasion of Earth 2150 B.C. as part of a self-explanitory meta joke, and mentioned in PROSE: The Dalek Invasion of Toyshops as an homage to the real world Terry Nation. The Time Lord based upon Nation is also intended to be an homage to Nation.