Felix Mather was an astronaut who later became the President of the United States.
Felix met the Eighth Doctor when the Doctor was hijacking a space shuttle to save his daughter, Miranda Dawkins. (PROSE: Father Time
The Doctor met Mather after his election to the position of President while investigating phony time traveler Baskerville. At this point Mather was the only politician that lifelong spy Jonah Cosgrove really trusted, despite his pro-British stance. Despite this, Mather worked with the Doctor in thwarting Baskerville's prophecies. (PROSE: Trading Futures)