Mallory Silberman is an internationally recognized litigator with nearly a decade of first-chair experience in high-stakes disputes before international institutions. Clients and peers describe her as an “extremely skilled advocate” with “an extraordinary strategic mind,” and praise “her dedication [and] commitment” to client service (see below).

At age 37, Ms. Silberman “is among the world’s most experienced young practitioners of investment arbitration”—a mechanism for resolving disputes between a sovereign country and a foreign investor. To date, Ms. Silberman has been counsel in more than 40 of these high-profile matters, representing not only well-known corporations, but also nearly eight percent of the countries in the world (including Chile, Costa Rica, the Czech Republic, the Dominican Republic, Guatemala, Hungary, the Kyrgyz Republic, Panama, Peru, the Philippines, the Slovak Republic, South Korea, Sweden, and Turkey). These cases have involved, among other things, intellectual property issues, transportation concessions, telecoms licenses, renewable energy, mining, bank regulation, environmental protection, taxation, and public health measures.

In 2019, Ms. Silberman was named one of the top five "under 40" international arbitration attorneys worldwide (Law360). Her work has also been recognized by Who's Who Legal (Global Leader in Arbitration, 2022) (Future Leader in Arbitration, 2017–2021); Latinvex (Latin America's Top 100 Female Attorneys, 2017–2021); The Legal 500 Latin America (Next Generation Partner in International Arbitration) (three times); Super Lawyers (Rising Star in International Law) (six times); and others.

In addition to being a partner at Arnold & Porter, Ms. Silberman currently serves as the chair of the International Dispute Resolution Committee of the DC Bar. She is also an adjunct professor at the Georgetown University Law Center, where she has taught since 2012. She frequently speaks at industry conferences; is a fellow of the Chartered Institute of Arbitrators; and is a member of the Peer Review Board of the American Review of International Arbitration.


  • The Kingdom of Sweden in connection with a treaty claim threatened by Huawei.
  • The Republic of Turkey in a treaty arbitration before the International Centre for Settlement of Investment Disputes (ICSID), which relates to alleged government measures in the wake of the failed 2016 coup d’état.
  • The Czech Republic in its defense against treaty claims leveled by a blood plasma broker.
  • The Republic of Korea in an ICSID arbitration involving a $4.7 billion claim by the Lone Star Funds.
  • The Republic of the Philippines in its defense against treaty claims asserted at ICSID by Shell.
  • The Czech Republic in a case under the arbitration rules of the United Nations Commission on International Trade Law (UNCITRAL), involving claims under several treaties, including the Energy Charter Treaty.
  • Government agencies of the Federal Republic of Nigeria as amici curiae in a proceeding before the US Court of Appeals for the Second Circuit.
  • Government delegates regarding the ISDS reform efforts being conducted by ICSID and by UNCITRAL Working Group III.


Reform in Investment Arbitration: New Developments at ICSID and UNCITRAL
Speaker, International Law Institute Webinar
ISDS and the Environment
Moderator, 11th Prague Investment Treaty Arbitration Conference
Dual Nationality and Dominant and Effective Nationality in Investment Arbitration
Moderator, World Arbitration Update
Substantive Standards in Practice
Guest Lecturer, Queen Mary University of London
Hot Topics in Arbitration Co-Hosted by KCAB International
Arnold & Porter and KCAB International Webinar


Latin America's Top 100 Female Lawyers (2022)
The Legal 500 Latin America
"Next Generation Partners"—International Arbitration (2022-2023)
International Arbitration (2023)
Latin Lawyer 250
Arbitration (2022)


  • JD, University of North Carolina School of Law, 2009, with honors
  • BA, Syracuse University, 2006, magna cum laude, Phi Beta Kappa
  • District of Columbia
  • Maryland
  • US Court of Appeals for the Second Circuit
  • English
  • Spanish
  • Italian

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