Adduci, Mastriani & Schaumberg LLP

Jonathan J. Engler

Jonathan J. Engler
t: 202-467-6300
f: 202-466-2006
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  • ITC Trial Lawyers Association
  • Federal Circuit Bar Association
  • International Trademark Association


  • Georgetown University Law Center, J.D., cum laude
  • Johns Hopkins University, B.A., cum laude


  • French
  • Hebrew


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

Jonathan J. Engler is an international trade attorney who concentrates on Section 337 intellectual property investigations before the U.S. International Trade Commission (ITC) as well as trade secret and trademark litigation. Jonathan has been ITC counsel in many cases involving semiconductors and smartphones over the years, both as complainant’s and respondent’s counsel. His practice includes a particular focus on the enforcement of ITC remedial orders, both before the ITC and U.S. Customs and Border Protection, and he has written frequently on this subject.

Prior to joining the firm, Jonathan served as an attorney in the Office of General Counsel at the ITC where he advised the ITC on matters relating to Section 337. There, he drafted briefs and presented oral arguments in multiple appellate cases before the U.S. Court of Appeals for the Federal Circuit (CAFC). He also acted, on an interim basis, as legal counsel to a Commissioner. Jonathan was also a Senior Attorney in the Office of General Counsel at the U.S. Department of Commerce, where he represented the Department in international trade litigation before the U.S. Court of International Trade, the CAFC, North American Free Trade Agreement arbitration panels, and the World Trade Organization.

Jonathan was previously in private practice at a large international firm where he practiced in the firm's Washington, D.C. and Brussels, Belgium offices counseling clients in international trade matters, including state aid to the aviation industry, technical barriers to trade (particularly with respect to international safety standards), and antidumping and countervailing duty investigations.

While in law school, Jonathan worked in the Office of Japan and China at the Office of the United States Trade Representative and as a summer associate at a large law firm in Tel Aviv, Israel, where he prepared corporate documents for transactions in U.S. securities markets.

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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