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.

Mac McComas

Senior Program Manager

Email | @MacMc21CC

Mac is the senior program manager of 21CC. His research focuses on access to capital for small businesses and minority entrepreneurs. He serves on the board of WYPR, NPR’s local affiliate station and on the board of The Friends of the Jones Falls. 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 full-time researcher with 21CC. He graduated Johns Hopkins in 2019 with a B.A. in Biophysics and Economics. Harboring interests in political economy and urban policy, Vrshank puts his varied background to use in quantitative analysis for 21CC’s projects. Vrshank’s work in 21CC hopes to prepare him for graduate school in the next few years.

Gary Lin

Post-Doctoral Fellow

Gary Lin is a post-doctoral research fellow with 21CC studying migration, trade, and cities. He received his PhD in Applied Economics and Management from Cornell University in 2020. Visit his webpage here.

Odis Johnson, Jr.

Senior Fellow

Odis Johnson Jr., PhD, is a senior fellow at 21CC and a Bloomberg Distinguished Professor at Johns Hopkins University, where he has faculty appointments in the Department of Health Policy and Management at the Bloomberg School of Public Health, the School of Education as Executive Director of the Center for Safe and Healthy Schools, and in the Department of Sociology at the Krieger School of Arts and Sciences. He also directs the Institute in Critical Quantitative, Computational, and Mixed Methodologies (ICQCM). View his faculty page here.

Bruce Hamilton

Senior Fellow

Bruce Hamilton is a senior fellow at 21CC and an 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.

Amine Ouazad

Senior Fellow

Amine is a senior fellow at 21CC and an Associate professor of Economics at HEC Montreal where he holds theendowed research professorship in “Urban and Real Estate Economics.” He is also a member of the First Street Foundation Lab, and DLA Piper Distinguished Visiting Professor of Economics at Johns Hopkins University in April 2020. View his research page here.

Maqbool Dada

Senior Fellow

Maqbool is a senior fellow at 21CC and a Professor in Operations Management & Business Analytics at Johns Hopkins Carey Business School. He has a joint appointment in Department of  Anesthesia and Critical Care Medicine, School of Medicine and is on the Core Faculty of the Armstrong Institute for Patient Safety and Quality. He has expertise in the areas of operations management, health care operations, supply chain management and pricing models. View his faculty page 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.

Stuart Schrader

Senior Fellow

Stuart Schrader is a senior fellow at 21CC, the Associate Director of the Program in Racism, Immigration, and Citizenship, and a Lecturer / Assistant Research Scientist at John Hopkins University. View his 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.

Start typing and press Enter to search