Pieter S. de Ganon

Pieter S. de Ganon

Senior Associate

Pieter de Ganon specializes in cross-border commercial disputes. Mr. de Ganon has served as counsel in arbitrations conducted under most major international rules—including AAA-ICDR, ICC, JAMS, JCAA, SCC, and UNCITRAL—applying both civil and common law. He has also tried cases in US federal court, and represented clients in court proceedings concerning the conduct of arbitral proceedings, including applications for interim measures and jurisdictional challenges. He has extensive experience handling IP- and Japan-related disputes.

Prior to joining Arnold & Porter in 2022, Mr. de Ganon practiced at another international law firm in Palo Alto and, before that, in Tokyo, where he also taught law at Hitotsubashi University’s Graduate School of International Corporate Strategy. Mr. de Ganon clerked for Judge Leonard B. Sand, U.S. District Court for the Southern District of New York, and Judge John T. Noonan, Jr., U.S. Court of Appeals for the Ninth Circuit. He received a JD from New York University School of Law, where he was a Furman Academic Scholar and served as an editor for the NYU Law Review. He received a BA from Columbia University and a PhD from Princeton University, both in Japanese history.

Mr. de Ganon speaks and reads Japanese fluently.


  • JD, New York University School of Law, 2011, New York University Law Review, Furman Academic Scholar, David Friedman Memorial Award
  • PhD, Japanese history, Princeton University, 2011, Fulbright Fellowship, Whiting Fellowship, A.W. Mellon Foundation Fellowship
  • BA, Columbia University, 2000, Phi Beta Kappa, magna cum laude, Japanese Ministry of Education Scholarship
  • California
  • New York
  • US Court of Appeals for the Ninth Circuit
  • US District Court, District of Delaware
  • US District Court, Northern District of California
  • US District Court, District of Arizona
  • US District Court, Southern District of New York, Judge Leonard B. Sand
  • US Court of Appeals for the Ninth Circuit, Judge John T. Noonan, Jr.

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