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 M. Wachter is Sussman Professor and Professor of Real Estate and Finance at The Wharton School, and Co-Director of Penn IUR. From 1998 to 2001, as Assistant Secretary for Policy Development and Research, U.S. Department of Housing and Urban Development, Dr. Wachter served as the senior urban policy official and Principal Advisor to the Secretary on overall HUD policies and programs. 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. She founded and currently serves as Director of Wharton’s Geographical Information Systems Lab. Previously, Wachter served as a member of the Board of Directors of the Beneficial Corporation from 1985 to 1998 and of the MIG Residential REIT from 1994 to 1998. 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 has been a member of the Advanced Studies Institute of the Homer Hoyt Institute since 1989. She co-founded and is Co-Director of the Penn Institute for Urban Research. She is the author of more than 150 scholarly publications and the recipient of several awards for teaching excellence at The Wharton School.


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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