Castells is a professor of urban geography at Berkley. He has written a number of books and articles about geography, the city, and the information society, including a three-volume analysis of contemporary capitalism, titled The Information Age. Garnham (2004, p. 165) refers to this as “the most sophisticated version” of the theory of the information society.
Castells' analysis involves economic, social, political, and cultural factors. I will focus on the economic, with a brief introduction to his analysis of space and the changing role of the nation state, and follow with an outline of some critiques of his work. Regrettably, this leaves much unmentioned, such as his theory of timeless time, of the social divides in modern cities and societies, or his examination of specific cases of social action in the context of what he calls the information city.