Bertrand Russell

Bertrand Russell was a philosopher that the Fourth Doctor claimed to have met. (AUDIO: The Justice of Jalxar) The Eighth Doctor recalled a picnic in a dusty valley with Russell, Christopher Isherwood, Aldous Huxley and Greta Garbo. (PROSE: The Scarlet Empress)

Adric told Tegan that Principia Mathematica was by "a chap called Bert Russell". (TV: Four to Doomsday)