David Zionts is an appellate litigator and international lawyer. He handles high stakes appeals across a range of subject matters, and regularly works on transnational disputes and issues of international law that arise in both U.S. and international tribunals.

David has litigated matters of constitutional law, administrative law, and statutes including the Anti-Terrorism Act, Alien Tort Statute, and Foreign Sovereign Immunities Act. He has successfully represented companies, individuals, and foreign sovereigns before:
• The Supreme Court of the United States, where he has represented clients at both merits and certiorari stages.
• Federal and state courts of appeals, where David has argued numerous appeals.
• District courts, where he has delivered arguments and crafted winning dispositive motions; and
• International tribunals including the International Court of Justice, where David has argued as an advocate on behalf of a sovereign.

David also maintains an active pro bono practice and has led litigation efforts in high-profile cases concerning immigration, transgender rights, reproductive rights, voting rights, and others.