He holds a PhD in Technology, Management, and Policy from MIT. He also has an MEng in Civil Engineering from the University of Southampton. Dr. Hall has over a decade of academic and professional experience in applying the concept of sustainable development to large-scale infrastructure systems with a specific emphasis on transportation, water supply, and sanitation systems. He is the Research Chair for the U.S. Transportation Research Board (TRB) Committee on Transportation and Sustainability. Dr. Hall can be reached at rphall@vt.edu. His web site is: http://ralphphall.wordpress.com/