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.