Mark Ovenden is a British writer and broadcaster. At the age of seven, he travelled alone ten miles on the London Underground, armed only with a map. He later gained entry to a Graphic Design course by submitting a reworking of the London tube map. His previous books are Great Railway Maps of the World, Metro Maps of the World, Paris Metro Style and London Underground by Design. He is a Fellow of the Royal Geographic Society. Maxwell Roberts has lectured at the University of Essex since 1993. His research interests now focus on information design and, in particular, schematic maps. He creates challenging designs and tests their usability and aesthetics. He has authored two books on maps including Underground Maps Unravelled. Designs have been exhibited in Germany, Austria, the USA, and the UK and he has given numerous public lectures, and interviews, including NPR and the BBC. His web page is www.tubemapcentral.com.