James Clark Maxwell
From Tardis Wiki, the free Doctor Who reference
James Clark Maxwell was a scientist who had investigated electromagnetism in 1854. He was mentioned by Theodore Maxtible in a conversation with the Second Doctor in 1866. (TV: The Evil of the Daleks)
In 1867, the Fifth Doctor "borrowed" an electromagnetic field generator from James Maxwell, his friend. (AUDIO: The Haunting of Thomas Brewster)