Aaron M. Panner

Aaron M. Panner is a partner at Kellogg Hansen whose practice focuses on antitrust law and U.S. Supreme Court and appellate litigation. Aaron represents clients in significant competition and appellate matters, including major monopolization litigation and matters reaching federal appellate courts. His work centers on substantive antitrust questions, appellate strategy, and Supreme Court advocacy. He is admitted in the District of Columbia, Massachusetts, New York, and before the U.S. Supreme Court.

Aaron earned his J.D. from Harvard Law School, magna cum laude, where he received the Fay Diploma and served as a Primary Editor of the Harvard Law Review. He earned a B.S. from Yale University, summa cum laude, and was elected to Phi Beta Kappa. After law school, he clerked for Judge Michael Boudin of the First Circuit and Justice Stephen G. Breyer of the U.S. Supreme Court. He served as a Foreign Service Officer with the U.S. Department of State.

Aaron’s practice includes major antitrust disputes and appellate matters requiring close attention to legal doctrine, economic evidence, and litigation strategy. His recent work has included outside counsel representation in significant monopolization litigation involving Meta and the Federal Trade Commission. He has also handled matters reaching the U.S. Supreme Court and federal appellate courts. His government service and judicial clerkships provide additional perspective when addressing disputes involving public institutions, regulatory frameworks, and issues with broad legal or commercial consequences.

Aaron M. Panner is recognized for work at the intersection of antitrust and appellate litigation. Chambers USA ranked him in 2026 in the Antitrust: Mainly Plaintiffs category for the District of Columbia. His practice reflects experience with complex competition disputes, appellate briefing, Supreme Court advocacy, and strategic questions that can shape the course of major litigation. Clients rely on his ability to analyze difficult legal issues, work with detailed factual and economic records, and present focused arguments in consequential cases.

Law Office Affiliations

• Partner, Kellogg, Hansen, Todd, Figel & Frederick: P.L.L.C.
• Member, Massachusetts Bar Association
• Member, New York State Bar Association
• Member, District of Columbia Bar

Licensed State

• Massachusetts
• New York
• District of Columbia

Education

• Harvard Law School
  Juris Doctor (JD) (Magna Cum Laude)
• Yale University
  Bachelor of Science (BS) (Summa Cum Laude)

Awards & Badges