Managing Associate
Washington, D.C.
Arielle Mourrain Jeffries is an experienced appellate advocate focusing on high-stakes, precedent-setting cases nationwide.
Arielle has briefed multiple cases before the United States Supreme Court, as well as nearly every federal appellate court across the country. She has argued appeals before the United States Court of Appeals for the Fifth, Sixth, Ninth, Tenth, Eleventh, and D.C. Circuits.
Prior to joining Orrick, Arielle was an appellate attorney in the Department of Justice’s Environment and Natural Resources Division, where she represented the United States and its agencies in dozens of cases involving challenges to the legality of federal laws, actions, and programs. Her experience included litigating cutting-edge matters involving federal energy policy, the Clean Water Act, the Appointments Clause, the Endangered Species Act, and the Administrative Procedure Act.
Before joining DOJ, Arielle served as a law clerk for the Honorable R. Guy Cole of the United States Court of Appeals for the Sixth Circuit.