Bill is the head of the Administrative Law Group and co-chair of the Environmental Team. Bill's practice focuses on air quality issues, including regulatory development and related litigation; compliance counseling and enforcement defense; legislative advice; and permitting. Prior to joining Hunton & Williams, Bill served for two years as Acting Assistant Administrator for Air and Radiation at the U.S. Environmental Protection Agency. As EPA's senior official on air issues, he was responsible for all aspects of the Agency's air program--from stationary sources, to motor vehicles and fuels, to climate change. Before accepting this position, Bill served for four years as the chief counselor of the Assistant Administrator.
Bill has testified on air quality issues before Congress on numerous occasions and has spoken at dozens of environmental conferences over the past several years. He is a member of the US District Court for the District of Columbia and the US Court of Appeals for the DC Circuit. He is also a Registered Professional Chemical Engineer in the State of Delaware.