Mark Chambers is an architect and director of sustainability for the City of New York. He leads the design and development of policies and programs to enable a resilient, zero-carbon built environment and a fair, healthy future for all 8.6 million residents of the largest city in the United States. This future vision is laid out in the citywide strategic plan, OneNYC 2050. In 2019, Chambers spearheaded the world’s first mandated cap on greenhouse gas emissions from large buildings, which will usher in an era of high performance design throughout New York City to fight climate change. Previously, Chambers served as the director of sustainability and energy for Washington, DC, where he helped execute Washington’s Sustainable DC strategic plan and negotiated the nation’s largest municipal wind power purchase agreement at the time.