The tube map is iconic and its design is widely acclaimed for its ability to depict the complex network of the London Underground in a non-geographic format that allows for easy navigation.
Harry Beck, an engineering draftsman who worked for the London Underground Signals office, created the tube map in its modern form in 1931 with its first publication in 1933.
For a short video documentary about Harry Beck and his tube map design, we suggest that at YouTube.
For detailed written articles, the following links may also be of interest:
3. Time Out