Aaron’s work includes federal appellate and district court litigation, primarily in the DC Circuit, and agency rulemaking proceedings regarding climate change and National Ambient Air Quality Standards.

Aaron’s representative clients include major companies and trade associations in the energy, mining and transportation industries. Aaron has extensive government and policy experience from background working as an advisor to the US Congress and the White House. He is admitted to practice before the US Courts of Appeals for the Third, Fourth, Fifth, Sixth, Eighth, Ninth, Tenth and DC Circuits; and the US District Court for the District of Columbia.