Joseph Rykwert is an architectural historian who has spent more than four decades studying how we relate to our cities, and how our cities change our relationships to each other. He's written nearly a dozen books exploring urban life and how cities develop, most recently The Seduction of Place: The History and Future of Cities (2000). CNN just conducted a fascinating interview with Rykwert. From CNN.com:

CNN: What is your assessment of the increasing prevalence of barriers and CCTV in public buildings and spaces today?