Andrew A. Lyonsberg - McDermott Will & Emery


Andrew Lyonsberg focuses his practice on litigation in the Supreme Court and appellate courts across the country, as well as major motions at the trial-court level. He has briefed more than fifty appellate matters and dispositive motions, and has argued before the US Courts of Appeals for the Fifth, Sixth, and Seventh Circuits. Andrew also has extensive experience with agency litigation under the Administrative Procedure Act, including several recent victories setting aside federal agency action.

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  • Obtained a Supreme Court victory expanding judicial review over administrative decisions on Convention Against Torture claims. (Nasrallah v. Barr)
  • Won a complex statutory-interpretation decision in the Supreme Court securing a favorable construction of the Immigration and Nationality Act. (Guerrero-Lasprilla v. Barr/Ovalles v. Barr)
  • Obtained a permanent nationwide injunction on behalf of a consortium of leading colleges and universities, blocking an immigration policy detrimental to the interests of international students. (Guilford College v. Wolf, M.D.N.C.)
  • Helped secure a Supreme Court win in a case that significantly narrowed the administrative law doctrine of Auer deference. (Kisor v. Wilkie)


  • The Best Lawyers in America, Ones to Watch in Appellate Practice, 2023-2024
  • District of Columbia Courts, Capital Pro Bono Honor Roll, 2023

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Yale Law School, JD, 2016
Williams College, BA, magna cum laude, 2011

District of Columbia

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