President of the United States

The President of America was the political leader of the United States of America.

19th century

 * Thomas Jefferson - The Doctor assisted him in drafting the Declaration of Independence, decades before Jefferson became president (DW: The Lazarus Experiment - deleted scene)
 * Abraham Lincoln (DW: The Chase)

1960s

 * John F. Kennedy (MA: Who Killed Kennedy, DW: Rose)

1990s

 * Carroll (DWM: Rennigan's Record)
 * Tom Dering (EDA: Option Lock)

2000s

 * Springsteen (NA: Eternity Weeps)
 * Norris (NA: Cat's Cradle: Warhead)
 * George W. Bush (WC: Death Comes to Time)
 * Arthur Coleman Winters (DW: The Sound of Drums) - referred to as "President Elect"; killed by the Toclafane in May of 2008.
 * Felix Mather (EDA: Trading Futures)
 * Arnold Schwarzenegger (DW: Bad Wolf)
 * An unnamed President affected by Martin Trueman's hypnosis (SJA: Secrets of the Stars)
 * Barack Obama (DWM: Ghosts of the Northern Line, DW: The End of Time) - along with everyone else on Earth, was turned into a copy of the Master

2010s

 * Barack Obama (see above; the events of The End of Time extend into 2010)

18th century

 * Benjamin Franklin (BFA: Seasons of Fear, BFA: Neverland)