Adduci, Mastriani & Schaumberg LLP

V. James Adduci II

V. James Adduci II
Managing Partner
t: 202-467-6300
f: 202-466-2006
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  • American Bar Association (Sections on Administrative and International Law)
  • American Intellectual Property Law Association
  • Customs and International Trade Bar
  • Customs Lawyers Association
  • District of Columbia Bar Association (Sections on International and Intellectual Property Law)
  • Federal Circuit Bar Association (Board of Governors, 2004-2006, Former Chairman of the International Trade Committee)
  • Illinois State Bar Association
  • ITC Trial Lawyers Association
  • Virginia State Bar Association
  • Washington International Trade Association


  • John Marshall Law School, J.D.
  • University of Colorado, B.A. 


  • District of Columbia
  • Illinois (Inactive)
  • Virginia (Inactive)
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Court of International Trade
  • U.S. Supreme Court

V. James Adduci II is the founding and managing partner of Adduci, Mastriani & Schaumberg, LLP, a Washington, D.C.-based law firm focused on international trade matters. Annually recognized as a leader in the field of Section 337 litigation before the U.S. International Trade Commission, the firm has the largest collection of international trade attorneys specializing in Section 337 practice under one roof. The attorneys at his firm have participated in nearly a quarter of the 850+ Section 337 investigations filed before the U.S. International Trade Commission. In his practice, Jim advises a diverse group of clients on international trade, intellectual property, and international commercial transactions. He represents parties in cases involving all of the major trade statutes before various government agencies and the courts.

Prior to entering private practice, Jim served as legal counsel to the ITC where he dealt with all matters within the Commission's jurisdiction, including unfair competition cases under Section 337, antidumping and countervailing duty actions, and escape clause proceedings. He was appointed by the U.S. Trade Representative as a member of the U.S. delegation to the Multilateral Trade Negotiations (Tokyo Round) in Geneva. There, he was principally involved in negotiations concerning import safeguards. 

Jim and his firm have received local and national recognition for their work in international trade and Section 337 litigation from publications such as Corporate Counsel, Chambers USA: America's Leading Lawyers for Business, The Legal 500, IP Law & Business, Washingtonian Magazine, Managing Intellectual Property, and Super Lawyers.

Jim has served on the board of directors of several major multinational corporations. He lectures and publishes articles on various international trade issues, including international finance and investment and intellectual property protection.

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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