Margaret-Rose Sales is counsel in Mayer Brown’s International Trade practice. She focuses on international trade compliance and international trade litigation and dispute settlement, including World Trade Organization (WTO) disputes.

Margaret advises clients on economic sanctions, export controls, and anti-boycott laws. She assists clients with transactional due diligence and compliance, corporate compliance and training programs, license applications, internal investigations and voluntary disclosures. In the area of import compliance, Margaret’s experience includes working with clients to identify potential duty savings and minimize customs duties through tariff classification, rules of origin and duty drawback. She has assisted clients with legal challenges to tariff classifications in the United States and Canada, and has advised clients on preparing voluntary disclosures of potential customs violations.

Her experience also includes representing clients in antidumping and countervailing duty proceedings before the US Department of Commerce and the US International Trade Commission, and in related litigation at the US Court of International Trade and the US Court of Appeals for the Federal Circuit. Margaret has represented foreign governments in WTO dispute settlement proceedings, including the government of Indonesia in a successful challenge to US restrictions on clove cigarettes. This case was selected as the “Global Dispute of the Year: International Litigation” in the American Lawyer’s inaugural Global Legal Awards in 2013.

Margaret also counsels clients on compliance with lobbying disclosure laws, US House and Senate ethics rules, and campaign finance laws.

During 2015-2016, Margaret served as an in-house lawyer for the Oneida Nation of New York and Oneida Nation Enterprises, LLC, advising the Oneida Nation’s business enterprises on an array of regulatory and legislative issues, including gaming, hospitality, land, environmental, tax, transportation and public safety issues. Margaret also previously served in the Office of International Affairs of US Customs and Border Protection, where she worked on the negotiation of bilateral customs mutual assistance agreements.

In 2016 Margaret returned to Mayer Brown, where she began her law firm career as an associate.

Spoken Languages

  • English
  • French


Georgetown University Law Center, JD, cum laude
Executive Editor, Georgetown Journal of International Law

Georgetown University, MS
Dean's Honors

McGill University, BA, with honors


  • District of Columbia
  • New York