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Mevelyn S. Ong


Mevelyn S. Ong

New York +1-212-558-4000+1-212-558-4000 +1-212-558-3588+1-212-558-3588
[email protected]
Mevelyn Ong is an associate in Sullivan & Cromwell’s Litigation Group. Her practice focuses on international dispute resolution, specifically international arbitration and cross-border anti-corruption investigations. Ms. Ong has represented clients around the world from diverse industry sectors in international arbitrations administered under the ICC, LCIA, UNCITRAL and AAA Rules. She has also represented large financial institutions in multi-jurisdictional sanctions and anti-money laundering investigations. Prior to joining the firm, Ms. Ong practiced in Australia and East Asia.

Ms. Ong’s pro bono activity is similarly international in scope, and has included assisting individuals in their petitions for asylum and family reunification in the United States. She is also a member of the New York City Bar’s Foreign & Comparative Law Committee, and the Business & Human Rights Working Group.


  • A North American mining company in an UNCITRAL arbitration in relation to an investment agreement dispute with a Central Asian state
  • A major European telecommunications company in an LCIA arbitration in relation to a share sale transaction dispute
  • A multi-national electronics company in an AAA arbitration in relation to an intellectual property contractual dispute
  • A global bank in an ongoing regulatory investigation by the DOJ concerning compliance with U.S. anti-money laundering, sanctions and other applicable laws in the Middle East
  • A global bank in an investigation by OFAC concerning compliance with U.S. sanctions law in Asia