Mark Chambers is Director of the NYC Mayor’s Office of Sustainability. He previously served as the Director of Sustainability and Energy for the Government of the District of Columbia, where he led an interdisciplinary team at the Washington D.C. Department of General Services to creatively implement energy management and resource conservation efforts across 30 million square feet of real estate, spanning all the District’s property assets including municipal offices, public schools, public housing, libraries, homeless shelters, data centers, emergency management services and parks and recreation facilities. In this role, he helped lead the development, administration and implementation of the District’s Sustainable DC commitments, most notably negotiating the nation’s largest municipal wind and solar renewable power purchase agreements. An urbanist and licensed architect, Chambers has dedicated his career to working on high performance design, zero waste policy and City scale building energy efficiency, with a focus on equitable economic growth, public engagement and promoting transparency through data and innovation.