21st Century Cities Initiative Staff

Matthew E. Kahn


Email | @MattKahn1966

Matthew E. Kahn is the Bloomberg Distinguished Professor of Economics and Business at Johns Hopkins University and the Director of JHU’s 21st Century Cities Initiative. He is a research associate at the National Bureau of Economic Research and a research fellow at IZA. He has taught at Columbia, the Fletcher School at Tufts University, UCLA and USC. He has served as a Visiting Professor at Harvard and Stanford and as the Low Tuck Kwong Distinguished Visiting Professor at the National University of Singapore. He is a graduate of Hamilton College and the London School of Economics. He holds a Ph.D. in Economics from the University of Chicago. He is the author of Green Cities: Urban Growth and the Environment (Brookings Institution Press 2006) and the co-author (joint with Dora L. Costa) of Heroes and Cowards: The Social Face of War (Princeton University Press 2009). He is also the author of Climatopolis (Basic Books 2010), Fundamentals of Environmental and Urban Economics (Amazon Kindle), and Blue Skies over Beijing: Economic Growth and the Environment in China (joint with Siqi Zheng published by Princeton Press). His research focuses on urban and environmental economics. View Matthew Kahn’s faculty page here.

Bruce Hamilton

Emeritus Professor of Economics and Director of Undergraduate Studies for the Department of Economics

Learn more about Professor Hamilton’s research interests here. See his Google Scholar page here.

Mac McComas

Program Coordinator

Email | @MacMc21CC

Mac is the program coordinator of 21CC. His research focuses on access to capital for small businesses and urban economic growth. He serves on the board of WYPR, on the board of Waverly Main Street, and is a mentor at William Pinderhughes Elementary in Sandtown-Winchester, Baltimore. He received his MA in Scottish History from the University of Edinburgh and his MLitt in Scottish Historical Studies from the University of St Andrews with a focus on the socio-economic causes of migration in 19th century Scotland and the Americas.

Vrshank Ravi



Vrshank Ravi is a researcher with 21CC and a recent graduate of Johns Hopkins University.

Rhiannon Jerch

Post-Doctoral Researcher

Rhiannon Jerch is a post-doctoral researcher with 21CC. Rhiannon recently received a PhD in Applied Economics & Management at Cornell University. Rhiannon’s research uses applied methods in microeconomics to understand the relationship between urban growth dynamics, public goods provision, and environmental regulation.  Learn more about Rhiannon’s research here.

Nils Kok

Senior Fellow

Nils is a senior fellow at 21CC and Associate Professor in Finance and Real Estate at Maastricht University. He is an expert on green buildings. See his Google Scholar page here. View his faculty page here.

Denise DiPasquale

Senior Fellow

Denise is a senior fellow at 21CC and lecturer in urban economics at Harvard University. She is the co-author of Urban Economics and Real Estate Markets. See her Google Scholar page here. View her faculty page here.

Mary Miller

Senior Fellow

Mary Miller is a senior fellow at 21CC. She served as the U.S. Department of the Treasury’s Under Secretary for Domestic Finance. As Under Secretary for Domestic Finance, Miller was responsible for developing and coordinating Treasury’s policies and guidance in the areas of financial institutions, federal debt financing, financial regulation, and capital markets.  Previously, Miller served as Assistant Secretary of the Treasury for Financial Markets, where she advised the Secretary on broad matters of domestic finance, financial markets, federal, state and local finance, and federal government lending policies. In this role, she was been responsible for Treasury’s management of the public debt. Prior to joining Treasury, Miller spent 26 years working for T. Rowe Price Group, Inc., where she was the director of the Fixed Income Division and a member of the firm’s Management Committee. Miller received a B.A. from Cornell University. She received an M.C.R.P. from the University of North Carolina at Chapel Hill. Miller also has earned her Chartered Financial Analyst designation.

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