Rupert Murdoch

Rupert was a man that used to organise his media interests in the late 20th and the early 21st centuries on Earth. Rupert's brain, however, had been swapped for the brain of a Bandril. (PROSE: A letter from the Master)

Behind the scenes
While his surname wasn't revealed in A letter from the Master, Rupert is clearly intended to be media tycoon Rupert Murdoch.