Clark Williams-Derry directs research and communications for Sightline Institute. Since joining Sightline in 2001, Mr. Williams-Derry has spearheaded groundbreaking research on a broad range of topics, including: mapping and analyzing sprawl; testing human breastmilk for toxics; designing a regional climate cap-and-trade policy; and exploring the intersection of transportation, land use, climate change, and human health. He also launched the Cascadia Scorecard project, Sightline’s regional index of progress towards a sustainable Pacific Northwest. He is an in-demand speaker, writer, consultant, and media spokesperson on sustainability topics.

Before joining Sightline, Williams-Derry investigated federal farm and wetlands policy as a senior analyst at Environmental Working Group (EWG), where he oversaw the development of EWG’s nationally-acclaimed farm subsidy database. He was the first webmaster for Grist Magazine. He started his career at the national researcher, legislative analyst, and media relations specialist for the National Audubon Society in Washington, DC. He graduated summa cum laude from Yale University in 1989 with a joint degree in mathematics and philosophy. A resident of Seattle, Williams-Derry spends his “spare” time with his wife Amy and their two daughters.