George H. W. Bush

 was a President of the United States who, according to the Eighth Doctor, served between Ronald Reagan and Bill Clinton. (PROSE: Interference - Book One)

In 1999 he was present next to Rosa Parks as she is awarded the Congressional Medal of Honor by Bill Clinton for her services to the Civil Rights Movement. (TV: Rosa)

Behind the scenes
Bush's forenames weren't given in Interference, but the common-sense interpretation of the passage is that the author was referencing the real-life President George H. W. Bush.