Geoffrey Marshall (born August 1972)[1][4] is an English video producer, performer, and author from London who runs a YouTube channel which is predominantly transport-themed.

[5][6] Marshall has twice held the world record for the Tube Challenge: travelling to all London Underground stations in the fastest time possible.

[11] Marshall subsequently wrote the stage show TubeSpotting about his multiple attempts, which he performed at the Edinburgh Festival Fringe in 2014,[12] and several times since at the London Transport Museum.

The second episode, titled "24 Hours", showed his unsuccessful attempt to beat Jack Welsby's Tube Challenge world record.

[19] This was followed later in 2003 by "Race Around The Underground", part of Carlton Television's Metroland documentary series,[20] in which Marshall would have broken the record, had the Richmond Branch of the District Line not suffered a signal failure.

He travelled to all 48 mainland states and, in each one, visited a town or a place that shared a name with a station on the London Underground map: for example, Epping, Maine, where the journey started.

Despite having his filming equipment stolen during the trip,[23] Marshall turned the story into a one-hour YouTube documentary, as well as publishing an accompanying book.