Description of Stanford Business School Video: William J. Perry, the former U.S. Secretary of Defense, discussed game changers in energy at the “Innovations for Smart Green Cities: What’s Working, What’s Not, What’s Next” conference. The event was hosted by the Stanford Program on Regions of Innovation and Entrepreneurship (SPRIE) at the Stanford Graduate School of Business on June 26-27, 2012. Perry is the Michael and Barbara Berberian Professor (emeritus) at Stanford University and a senior fellow at the Freeman Spogli Institute for International Studies.