Joshua Naismith

Joshua Naismith was a 21st century Earth billionaire who played a major role in the plans of the newly resurrected Master.

Biography
Naismith lived in Great Britain and was said to employ a private army and keep a large stable. (TV: The End of Time) He was responsible for Neon, a phone company advertised on the side of the 200. (TV: Planet of the Dead) He also wrote the book Fighting the Future.

After the fall of the Torchwood Institute, Naismith acquired the Immortality Gate, a device of Vinvocci design, captured the Master and forced him to repair it. He wanted to use it to give his daughter, Abigail, immortality. Instead, the Master used the device to turn everyone in the world into a copy of himself, including Naismith. The Master's work was undone by, and Naismith and his daughter fled from their mansion and saw Gallifrey about to crash into Earth. Naismith and Abigail were later mentioned as having been arrested for crimes undisclosed, and put into prison. (TV: The End of Time)

Personality
While Naismith was certainly intelligent, he was essentially a vain, arrogant meddler who was out of his depth. (TV: The End of Time)

Behind the scenes

 * "Naismith" is another instance of Russell T Davies reusing names; his earlier children's drama serial Century Falls features a Dr. Josiah Naismith.