1. Senior Fellow, Center for Transportation Public-Private Partnership Policy, Schar School of Policy and Government, George Mason University, Fairfax, Virginia, USA
2. Policy Consultant, Guatemala
3. The World Bank, Washington, DC, USA
4. Center for Sustainable Development and Global Competitiveness, Stanford University, Stanford, California, USA
5. Bartlett School of Sustainable Construction, University College London (UCL), London, UK