Clients turn to Aaron when they face significant Clean Air Act regulatory matters. He has helped to resolve these matters before EPA, at the White House, and through his extensive litigation experience before the federal courts. Aaron’s previous roles as a legal advisor to the US Congress and as a lawyer for the White House help him provide insight and practical advice when counseling clients ranging from utilities to major corporations and trade associations in the energy, mining and transportation industries.
As a leader of the firm’s visibility practice, Aaron has been called upon to testify before the US House of Representatives. Aaron has also litigated significant visibility rules before numerous federal courts of appeals, arguing most recently before the Ninth Circuit.
Aaron’s climate change work has involved every significant EPA rulemaking action since the US Supreme Court’s decision in Massachusetts v. EPA. He has, for instance, helped clients develop their responses and find creative solutions in response to EPA’s Endangerment Finding, its mobile source rules, and the Clean Power Plan for existing electric generating facilities.
Aaron’s practice extends to a number of other areas, including environmental permitting on Tribal lands, litigation in the DC Circuit over fuel regulation, and new source performance standards (NSPS) and hazardous air pollutant (HAP) regulations. Most significantly, he is integral to the firm’s national ambient air quality standards (NAAQS) practice, and has led successful efforts before the DC Circuit and the White House to protect clients from new, unprecedented standards.
Aaron is admitted to practice before the US Supreme Court and the US Courts of Appeals for the Third, Fourth, Fifth, Sixth, Eighth, Ninth, Tenth, and DC Circuits. He is also admitted to the US District Court for the District of Columbia.