Adduci, Mastriani & Schaumberg LLP

John C. Steinberger

John C. Steinberger
Of Counsel
t: 202-467-6300
f: 202-466-2006
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  • District of Columbia Bar Association
  • Maryland State Bar Association


  • Harvard Law School, J.D.
  • Member, Harvard International Law Journal
  • University of North Carolina, B.S., Biology
  • University of Cincinnati, B.A., magna cum laude


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

John C. Steinberger is an international trade and customs attorney whose practice focuses on international trade regulation, customs matters, and related civil litigation before federal courts and binational dispute resolution panels.

John has practiced extensively before the Department of Commerce and the U.S. International Trade Commission, representing domestic and foreign clients in unfair trade actions under the antidumping and countervailing duty laws and in "safeguards" actions under Section 201 of the Trade Act of 1974. These trade disputes have involved a wide variety of industrial and food products, such as steel, roller bearings, industrial nitrocellulose, roofing nails, pork, raspberries, crawfish and crab meat, among many others. John has also advised private and governmental clients on the impact of WTO actions and has assisted domestic interests before the Office of the U.S. Trade Representative in obtaining relief under Section 301 of the Trade Act of 1974 against foreign impediments to market access.

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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