MARK ALAN HUGHES is a Professor of Practice at the University of Pennsylvania’s School of Design. He is a Faculty Fellow of the Penn Institute for Urban Research, a Senior Fellow of the Wharton School’s Initiative for Global Environmental Leadership, and a Distinguished Scholar in Residence at Penn’s Fox Leadership Program. He has taught at Penn since 1999 and before that taught at Princeton University's Woodrow Wilson School. He was Chief Policy Adviser to Mayor Michael A. Nutter and the founding Director of Sustainability for the City of Philadelphia, where he led the creation of the City's seven-year Greenworks Plan. He has been a weekly opinion columnist for the Philadelphia Daily News and for Next American City, and was a senior fellow at Brookings and the Urban Institute. Hughes holds a BA from Swarthmore and a PhD from Penn.