Great man about which people don't nearly know enough.
There was an episode of the recent series of Cosmos in which Neil de Grasse Tyson told the story of Humphrey Davy*, Michael Faraday and James Clerk Maxwell. It's a terrific bit of story telling about how three of the greatest scientists of the 19th Century inspired then next.
* a worthy choice for a bank note in his own right. Seems to have been the Brian Cox of his time with people gushing over his charm and good looks. Discovered seven elements, the arc lamp, anaesthesia (using nitrous oxide), burned a diamond, climbed Vesuvius when it was erupting and wrote poetry considered equal to that of Coleridge in his time.