Prof Manuel Castells is regarded as one of the most-cited sociologists in the world.
When most of us were still struggling to connect our modems in the 1990s, the Spanish academic was documenting the rise of the network society and studying the interaction between internet use, counter-culture, urban protest movements and personal identity.
BBC Newsnight economics editor Paul Mason interviewed Prof Castells in front of an audience at The London School of Economics for BBC Radio 4′s Analysis about his latest book Aftermath: The Cultures of the Economic Crisis.
Prof Castells suggests we may be about to see the emergence of a new kind of capitalism, with businesses growing out of the counter-cultures of the last 20 years. Here are some extracts from their conversation.