John Walke is a senior attorney and Director of Clean Air Programs with the Natural Resources Defense Council (NRDC), where he has general responsibility for Clean Air Act implementation. His work focuses on PSD/NSR preconstruction review programs and a variety of State Implementation Plan measures under Title I of the Act; air toxics programs under Title III of the Act; Title IV’s acid rain program; and the Title V operating permits program. Prior to joining NRDC, Walke worked for the United States Environmental Protection Agency, in the air and radiation law office of the Office of General Counsel. At EPA, Walke was the primary attorney responsible for the operating permits program under Title V of the Clean Air Act. He also worked extensively on issues relating to PSD/NSR programs, air toxics, monitoring, and enforcement under the Clean Air Act. Before working at EPA, Walke was an associate in the Washington, D.C. office of Beveridge & Diamond, P.C., where his practice concentrated on the Clean Air Act, the Clean Water Act, and the representation of individuals and corporations in criminal and administrative proceedings. Walke has a bachelor’s degree in English from Duke University and a law degree from Harvard Law School.