William Isasi has more than 20 years of experience advising governments and companies on all aspects of antidumping and countervailing duty proceedings and World Trade Organization (WTO) litigation. In private practice, he has represented companies in the aircraft, steel, oil and gas, chemical, paper, and ball bearing industries, and successfully secured low antidumping and countervailing duty tariffs for his clients. He also advises U.S. companies on the viability of petitioning for antidumping or countervailing duty orders. He joined the firm after serving as an Assistant Chief Counsel at the U.S. Department of Commerce, Office of the Chief Counsel for Trade Enforcement & Compliance. In that role, he provided extensive legal advice on trade enforcement to the Assistant Secretary for Enforcement & Compliance, Deputy Assistant Secretaries, and other Department officials.