Nathan Lewin is a member of the Bars of all United States Courts of Appeals and has orally argued appeals in every Circuit. He has argued and won appeals before en banc panels of 15 Circuit Judges (6th Circuit), 11 Circuit Judges (11th Circuit), 10 Circuit Judges (7th Circuit), and 9 Circuit Judges (D.C. Cir.).
Mr. Lewin has represented both appellants and appellees in civil and criminal cases. (During his service with the Department of Justice he represented the United States in the appeal of James Hoffa from his criminal conviction and in the US Supreme Court.) He successfully represented John Lennon in the appeal from an immigration deportation order to the Court of Appeals for the Second Circuit. Lennon v. Immigration and Naturalization Service, 527 F.2d 187 (2d Cir. 1975).
Mr. Lewin has also briefed, argued, and won appeals in the appellate courts of New York and the District of Columbia, where he is admitted to practice, as well as in some State appellate courts pro hac vice.
Alyza Lewin has assisted in the briefing of many appeals. She presented oral argument in the Supreme Court for the petitioner in Zivotofsky v. Kerry, 135 S.Ct. 2076 (2015).