Adduci, Mastriani & Schaumberg LLP

Will E. Leonard

Will E. Leonard
t: 202-467-6300
f: 202-466-2006
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  • District of Columbia Bar
  • Louisiana State Bar Association
  • American Bar Association (Former Chairman, Standing Committee on Customs Law


  • Harvard University, LL.M.
  • Tulane University, B.A., LL.B.


  • District of Columbia
  • Louisiana
  • U.S. Court of International Trade
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Supreme Court

Will E. Leonard is an international trade attorney specializing in regulatory actions before the U.S. International Trade Commission, the U.S. Department of Commerce, and the U.S. Court of International Trade.

As a former chairman and commissioner of the U.S. International Trade Commission, and a former legislative aide and professional staff member of the Senate Finance Committee, Bill has extensive experience with trade remedy laws including antidumping orders, countervailing duty orders, Section 201 actions, Section 337 investigations, and import sanctions. Bill counsels both foreign and domestic companies seeking to impose or to defend against these remedies. He also works on customs law issues including classification and valuation of merchandise and country of origin issues.

Adduci, Mastriani & Schaumberg, L.L.P. is a Washington D.C. law firm and internationally recognized leader in the field of international trade law with an emphasis on Section 337 intellectual property litigation before the United States International Trade Commission (ITC).  Founded in 1981, the firm has over 30 years of experience practicing before the ITC, all other federal agencies involved in international trade, the United States Court of International Trade, and federal district and appellate courts.  As part of its Section 337 practice, the firm has participated in approximately one-third of all investigations instituted in the last ten years.  In other areas of international trade law, the firm represents clients in antidumping and countervailing duty proceedings, as well as advises clients on Customs valuation and classification, and on country of origin, duty preference programs, sanctions, and export control issues. The firm also advises clients on trade policy issues, including import and export opportunities and barriers, enforcement, and regulatory hurdles.  In addition to its international trade practice, the firm represents clients in a broad range of intellectual property disputes and counsels them on licensing and enforcement.

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