Richard D. Wagner, AIA, PhD, is principal with David H. Gleason Associates, Inc. He was founding Director and Professor of the Master of Arts in Historic Preservation Program at Goucher College, USA (1996 to 2016). He also founded and chaired the Urban Main Street Program Manager at the National Main Street Center, and College Park City University Partnership, a local development corporation jointly sponsored by the University of Maryland, College Park and the City of College Park. He is a member of the Maryland Advisory Council on Historic Preservation. He received his BArch from the University of Virginia and PhD from the University of Edinburgh for his dissertation on the economics of preservation. de Teel Patterson Tiller served with the US National Park Service for nearly thirty years, the last seven as Deputy Associate Director for Cultural Resources. Prior to joining the Park Service, he was a historic preservation planner with the Texas Historical Commission and the West Texas Council of Governments in El Paso, Texas. He has been adjunct faculty teaching architectural history and historic preservation policy, planning, and practice at George Washington University, the Universities of Wyoming and Virginia, and Kansas State University, among others. He is a Trustee of The Committee of 100 on the Federal City and Officer of the Board of The Manassas Battlefield Trust. He received a BA in Drama and Theater, an MA in Architectural History from the University of Virginia, and a DHL from Goucher College, USA.