This book describes the remarkable qualitative inprovements which have taken place in central Copenhagen over the past 34 years, and how they have been accomplished. It presents a method of assessing urban quality and gives a thorough insight into how people use urban spaces. A handbook on how to create human qualities in the city.
Jan Gehl is a Danish architect and urban design consultant based in Copenhagen and whose career has focused on improving the quality of urban life by re-orienting city design towards the pedestrian and cyclist.
I think one of the most important reasons of Gehl's uncountable followers is just his documentation of his career and his approach through the problems!