Albert Einstein
Albert Einstein (1879-1955) was renowned as one of the most brilliant scientists of the 20th century. The Doctor claimed to have met Einstein. (DW: The Stones of Blood)
In the 1940s, the Rani kidnapped Einstein and brought him to Lakertya so that his genius could be used to help create her Time Brain. (DW: Time and the Rani)
The Doctor claimed that he knew Einstein. (TN: The Eye of the Tyger).
In the 2010 Christmas Special (DW: A Christmas Carol) the Doctor produces a photograph of him and Albert Einstein.
The Doctor used Einstein as an example of great people who had Dyslexia in order to encourage Elliot Northover to continue trying. (DW: The Hungry Earth)