Penn IUR is affiliated with more than 200 experts in the field of urbanism. Its Faculty Fellows program identifies faculty at the University of Pennsylvania with a demonstrated interest in urban research; the Penn IUR Scholars program identifies urban scholars outside of Penn; and the Penn IUR Fellows program identifies expert urban practitioners. Together, these programs foster a community of scholars and encourage cross-disciplinary collaboration.

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Emerging Scholar

Seung Ah Byun


Senior Planner for Water Resources, Brandywine Conservancy’s Municipal Assistance Program


Seung Ah Byun is the Senior Planner for Water Resources with the Brandywine Conservancy’s Municipal Assistance Program. Her responsibilities involve developing and managing innovative stormwater management practices, green infrastructure tools, and source water protection projects at the watershed and local scales. She also provides technical expertise to municipalities on compliance with state and federal water quality regulations such as MS4 and TMDL requirements. Previously, Seung Ah was a water resources engineer at CDM Smith, primarily consulting for the City of Philadelphia’s Office of Watersheds and CSO Program.  Seung Ah received her doctorate and a master’s degree from the University of Pennsylvania, School of Design’s Department of City and Regional Planning. She also obtained a master’s degree in environmental engineering from Drexel University and a bachelor’s of science in systems engineering from the University of Pennsylvania. Seung Ah is a licensed Professional Engineer and is a LEED Accredited Professional. 


Selected Publications

Byun, Seung Ah. James T. Smullen, Mark Maimone, Robert E. Dickinson, and Christopher S. Crockett. (2003) “Overcoming Obstacles for the Application of SWMM to Large-scale Watersheds.” Practical Modeling of Urban Water Systems, Monograph 11. Edited by James, William. CHI, Guelph, Ontario, Canada.


Faculty Fellow

Susan Wachter


Albert Sussman Professor of Real Estate, Professor of Finance

Co-Director, Penn Institute for Urban Research


Susan Wachter is Sussman Professor and Professor of Real Estate and Finance at The Wharton School of the University of Pennsylvania. From 1998 to 2001, she served as Assistant Secretary for Policy Development and Research, U.S. Department of Housing and Urban Development, the senior urban policy official and Principal Advisor to the Secretary. During her tenure at HUD, Wachter’s office was responsible for the New Markets Tax Credit, the major legislative initiative for urban revitalization, with the goal of attracting private capital into low-income communities. At The Wharton School, she was Chairperson of the Real Estate Department and Professor of Real Estate and Finance from July 1997 until her 1998 appointment to HUD. At Penn, she co-founded and currently is Co-Director of the Penn Institute for Urban Research. She also founded and currently serves as Director of Wharton’s Geographical Information Systems Lab. She was the editor of Real Estate Economics from 1997 to 1999 and currently serves on the editorial boards of several real estate journals. Wachter is the author of more than 200 scholarly publications and the recipient of several awards for teaching excellence at The Wharton School. Her forthcoming edited volume, Fair Housing, will be published by Penn Press. Previous volumes include Shared Prosperity in America’s Communities and Neighborhoods and Life Chances. Wachter has served on multiple for-profit and not-for-profit boards and currently serves on the Affordable Housing Advisory Committee of Fannie Mae and the Office of Financial Research Advisory Committee of the U.S. Treasury. She frequently comments on national media and testifies to Congress on U.S. housing policy.

Selected Publications

Acolin, Arthur, Xudong An, Raphael Bostic, and Susan M. Wachter. 2017. “Homeownership and Nontraditional and Subprime Mortgages.” Housing Policy Debate 27(3): 393-418.

Wachter, Susan M., Arthur Acolin, and Scott Bernstein. 2017. “Opportunity, Housing Access, and Infrastructure.” Housing Policy Debate 27(3): 468-471.

Wachter, Susan M. and Patricia Mccoy. 2017. “Representations and Warranties: Why They Did Not Stop the Crisis.” In Evidence and Innovation in Housing Law and Policy, edited by Lee Fennell and Benjamin Keys. Cambridge, U.K.: Cambridge University Press.

Wachter, Susan M. and Joseph Tracy, eds. 2016. Principles of Housing Finance Reform. Philadelphia: University of Pennsylvania Press.

Wachter, Susan M., ed. 2016. Public Pensions and City Solvency. Philadelphia: University of Pennsylvania Press.

Acolin, Arthur, Laurie S. Goodman, and Susan Wachter. 2016. “A Renter or Homeowner Nation?” Cityscape 18(2): 145-158.

Acolin, Arthur, Jesse Bricker, Paul S. Calem, and Susan Wachter. 2016. “Borrowing Constraints and Homeownership.” American Economic Review: Papers and Proceedings 106(5): 625-629.

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