Sean C. Cahill is vice president of development for Property Group Partners and oversees development activities in the Washington metropolitan area. Before joining the company in 2004, he was the chief operating officer at Horning Brothers where he supervised daily operating aspects of large development projects. Mr. Cahill is a member of the Urban Land Institute, Washington Real Estate Group, Montgomery County Chamber of Commerce, National Association of Industrial & Office Properties and the International Development Research Council. He has a bachelor of science degree in architecture from Catholic University of America. Active in developing green standards in Washington, Mr. Cahill is a LEED AP, a member of the Mayor’s Green Building Advisory Council and a member of the USGBC. He successfully guided the recent construction of two Property Group Partners office buildings that qualified for the first LEED Gold and LEED Platinum certifications in the District. He is a board member of the District of Columbia Preservation League, the DC Building Industry Association and Casey Trees, a community tree planting program.

Harriet Tregoning is the Director of the Washington DC Office of Planning, where she works to make DC a walkable, bikeable, eminently livable, globally competitive and sustainable city. Prior to this she was the director of the Governors’ Institute on Community Design and co-founder, with former Maryland Governor Glendening, and executive director of the Smart Growth Leadership Institute. Tregoning developed her expertise in state level action in the State of Maryland where she served Governor Glendening as both Secretary of Planning and then as the nation's first state-level Cabinet Secretary for Smart Growth. Prior to her tenure in Maryland state government, Tregoning was the director of Development, Community and Environment at the United States Environmental Protection Agency. Tregoning’s academic training is in engineering and public policy. She was a Loeb Fellow at the Harvard University Graduate School of Design for 2003-2004.

Jess Zimbabwe was named founding Executive Director of the ULI Daniel Rose Center for Public Leadership in 2009. The Center’s flagship program is the Daniel Rose Fellowship for public leaders, which brings the mayors and senior leadership teams of 4 cities together for a year-long program of learning from land use experts, technical assistance, study tours, leadership development, and peer-to-peer exchange. The Rose Center also holds forums on of public/private real estate development and workshops to educate public officials. Previously, Jess was the Director of the Mayors’ Institute on City Design. In that capacity she worked with over 125 American mayors and cities to help local leaders advocate for better built environments in their own communities. Prior to that, Jess served as the Community Design Director at Urban Ecology, providing pro bono community planning and design assistance to low-income neighborhoods in the San Francisco Bay Area. Jess was a Comparative Domestic Policy Fellow at the German Marshall Fund, and a Fellow of the Women’s Policy Institute of the Women’s Foundation of California. She serves on the Board of Directors of Next American City. She is a licensed architect, certified city planner, and a LEED-Accredited professional.

Sean C. Cahill is vice president of development for Property Group Partners and oversees development activities in the Washington metropolitan area. Before joining the company in 2004, he was the chief operating officer at Horning Brothers where he supervised daily operating aspects of large development projects. Mr. Cahill is a member of the Urban Land Institute, Washington Real Estate Group, Montgomery County Chamber of Commerce, National Association of Industrial & Office Properties and the International Development Research Council. He has a bachelor of science degree in architecture from Catholic University of America. Active in developing green standards in Washington, Mr. Cahill is a LEED AP, a member of the Mayor’s Green Building Advisory Council and a member of the USGBC. He successfully guided the recent construction of two Property Group Partners office buildings that qualified for the first LEED Gold and LEED Platinum certifications in the District. He is a board member of the District of Columbia Preservation League, the DC Building Industry Association and Casey Trees, a community tree planting program.

Harriet Tregoning is the Director of the Washington DC Office of Planning, where she works to make DC a walkable, bikeable, eminently livable, globally competitive and sustainable city. Prior to this she was the director of the Governors’ Institute on Community Design and co-founder, with former Maryland Governor Glendening, and executive director of the Smart Growth Leadership Institute. Tregoning developed her expertise in state level action in the State of Maryland where she served Governor Glendening as both Secretary of Planning and then as the nation's first state-level Cabinet Secretary for Smart Growth. Prior to her tenure in Maryland state government, Tregoning was the director of Development, Community and Environment at the United States Environmental Protection Agency. Tregoning’s academic training is in engineering and public policy. She was a Loeb Fellow at the Harvard University Graduate School of Design for 2003-2004.

Jess Zimbabwe was named founding Executive Director of the ULI Daniel Rose Center for Public Leadership in 2009. The Center’s flagship program is the Daniel Rose Fellowship for public leaders, which brings the mayors and senior leadership teams of 4 cities together for a year-long program of learning from land use experts, technical assistance, study tours, leadership development, and peer-to-peer exchange. The Rose Center also holds forums on of public/private real estate development and workshops to educate public officials. Previously, Jess was the Director of the Mayors’ Institute on City Design. In that capacity she worked with over 125 American mayors and cities to help local leaders advocate for better built environments in their own communities. Prior to that, Jess served as the Community Design Director at Urban Ecology, providing pro bono community planning and design assistance to low-income neighborhoods in the San Francisco Bay Area. Jess was a Comparative Domestic Policy Fellow at the German Marshall Fund, and a Fellow of the Women’s Policy Institute of the Women’s Foundation of California. She serves on the Board of Directors of Next American City. She is a licensed architect, certified city planner, and a LEED-Accredited professional.

Professor Emeritus, University of Maryland School of Architecture, Planning and Preservation. A member of the faculty since 1968, Professor Lewis helped start and subsequently nurture the University of Maryland's School of Architecture, established by the University in 1967. During the School's early years, in addition to teaching design, he initiated and taught two seminal courses: "Introduction to the Built Environment" (ARCH 170), a wide-ranging survey of architecture and urban design fundamentals for freshmen and sophomores; and "Economic Determinants in Architecture," an elective for advanced architectural students focused on the real estate development process. During the summer of 1971, accompanying the late Charles Moore, distinguished visiting Kea Professor, and Dean John Hill, he led 17 students--the School's first graduating class--on a five-week study tour of Western Europe, Turkey and Tunisia, the School's first summer study abroad program. In 1996, in collaboration with Professor Marie Howland, Director of the Urban Studies program, and Professor Matthew Bell, Professor Lewis directed a group of American architecture and urban planning students, along with Russian architecture students, engaged in the School's first-ever program in St. Petersburg, Russia. Professor Lewis has always combined teaching and practice, believing that one informs and energizes the other. His experience as a practitioner began in the Peace Corps in Tunisia, where he was an architect for the Ministry of Public Works and was responsible for designing more than 30 government-financed projects, over half of which were built. These included municipal auditoriums, shopping facilities, schools, a boy scout camp, a movie theater, a hotel, a historic mosque renovation, and public gardens. Immediately after he began teaching, he established his architecture and planning firm based in Washington, DC. Since 1969, he has designed award-winning private residences, low-income and elderly housing as well as market-rate housing, community buildings, public and private recreational facilities, art centers, commercial structures and schools. His firm has prepared master plans and design guidelines for new communities or for the expansion of existing communities, both in the eastern United States and abroad. In 1984, Professor Lewis made a proposal to The Washington Post to write and illustrate a series of essays about the history of Washington, DC, and its architecture. The 1984 essay series proved very successful, and since then, he has been a regular Washington Post columnist writing thematic articles and drawing accompanying cartoons. His columns cover architectural design, planning, land use regulation, "smart growth," housing, transportation and infrastructure, historic preservation, landscape architecture, sustainability and public policy affecting the built environment. In 1987, the AIA Press compiled a number of "Shaping the City" articles and cartoons and published a book of the same name. The MIT Press published his first book, Architect? A Candid Guide to the Profession, in 1985, which became an MIT Press best-seller. A revised edition was published in 1998. Used as an introductory text for would-be architects at universities throughout North America, the book has been translated into Japanese, Korean and Spanish.