William F. Marshall


William Marshall is Of Counsel to the firm in the New York office.  Prior to his return to the firm and to the United States, William has been practicing for more than 15 years in Hong Kong where he has been a senior partner and international trade practice group leader for large international firms in Greater China as well as for the Asia Pacific Region.  He has also served as the Global Supply Chain Counsel and Asia Pacific General Counsel for a large publicly-traded retail brand before returning to private practice in Hong Kong.


William’s practice focuses on regulatory advice for inbound investment and trade with China including customs controversy advice, product regulatory advice, export control and sanctions advice, and Chinese direct investment.  In addition, William has many years of experience with structuring global supply chains for international tax, indirect tax, duty and regulatory efficiency.


William has been interviewed and provided insights to major media outlets such as Bloomberg News, South China Morning Post, Wall Street Journal, the New York Times, Singapore Straits Times, the Economic Times of Singapore, American Lawyer Magazine, Asia Legal Business, and Hong Kong CEO Magazine.


William frequently speaks at conferences around the world on matters relating to international trade regulation, supply chain planning and structuring, and Asia business strategy.  He has been a keynote speaker at Investor conferences for HSBC in Hong Kong and Singapore as well as for Citibank’s ASEAN investor roadshow.  William routinely advises the chairman and board of directors of the world’s largest consumer goods sourcing and supply chain company, the largest luxury automotive dealer in Asia, as well as an American investment bank’s Asia private bank division.

Michael S. Holton


Michael Holton is Of Counsel in Washington D.C., who focuses on international trade relief and regulation, including antidumping duty and countervailing duty (AD/CVD) proceedings, section 201, 232, 301 and other safeguard escape clause relief proceedings, the Enforce and Protect Act (EAPA), and other AD/CVD customs issues. Prior to joining GDLSK, Michael worked at a nationally ranked AM LAW 100 firm and as a senior staff member in the Enforcement and Compliance unit (formerly Import Administration) at the U.S. Department of Commerce, International Trade Administration. Notably, he has significant experience representing foreign manufacturers, exporters, and U.S. importers in antidumping and countervailing duty proceedings at the Department of Commerce.  Additionally, Michael has successfully represented foreign exporters and U.S. importers in recent anti-circumvention proceedings.


Representative Experience:

  • Lead counsel in an AD and CVD review on Citric Acid from China obtaining a zero AD rate for a Chinese producer and exporter.
  • Lead counsel in an AD investigation on Narrow Woven Ribbons from Taiwan obtaining a zero AD rate and exclusion from AD duties.
  • Lead counsel in AD review on Tapered Roller Bearings from China successfully representing the Chinese producer, exporter and U.S. importer.
  • Co-lead counsel in an AD review on Multilayered Wood Flooring from China resulting in a zero percent AD rate.
  • Lead counsel or co-counsel on numerous other antidumping or countervailing duty investigations or reviews before the U.S. Department of Commerce and International Trade Representative.
  • Lead counsel or co-counsel in multiple cases before the Court of International Trade.

Kavita Mohan


Kavita Mohan is Of Counsel in the Firm’s Washington, DC office. Kavita has handled a wide range of complex legal and policy related international trade issues. Her experiences include representing foreign governments and foreign manufacturers in proceedings before the U.S. Department of Commerce, U.S. International Trade Commission, Court of International Trade, and Court of Appeals for the Federal Circuit. Kavita previously worked on developing and executing U.S.-India trade policy as an India Desk Officer at the U.S. Department of Commerce. Prior to that, she served as an Analyst at the U.S. Department of Commerce’s Import Administration, conducting AD/CVD investigations and reviews. Kavita was selected as a “Rising Star” by Super Lawyers in 2014, 2016, 2018, and 2019. She has also served as a Vice-Chair of the American Bar Association’s India Committee since 2012.

Neil S. Helfand


Neil S. Helfand is Of Counsel to the firm and resident in its New York office. Prior to entering private practice, he served as an attorney with U.S. Customs and Border Protection in the Office of Regulations and Rulings in Washington, DC, and as an Information Specialist focused on illicit trade issues in the Federal Research Division of the Library of Congress. Mr. Helfand also currently serves as an officer in the United States Navy Reserve.


Mr. Helfand’s practice is concentrated in Customs and international trade law. He regularly counsels clients in connection with a variety of issues, including country of origin determination and marking requirements, tariff classification and valuation, supply chain security, free trade agreements, focused assessments, detentions, seizures, liquidated damages, and complex penalty investigations. Mr Helfand also has extensive experience setting up first sale and other duty savings initiatives and internal compliance programs.


Mr. Helfand has authored articles on customs and international trade matters for numerous business and trade publications.

David J. Lyon


David Lyon practices in the area of business organizations and transactions with a heavy emphasis on international transactions and international tax planning. Part of his practice also includes estate and income tax planning for the owners of the businesses he represents. David’s experience includes business and tax planning for private and public companies; including representing private and public companies on both the buying and selling side of sale or acquisition transactions, sophisticated joint venture planning, and the creation of structures for doing business outside the United States. David graduated from Brigham Young University in 1972 with a degree and economics and obtained his law degree from Cornell University Law School in 1975. He continued to receive a Masters of Law (Taxation) from New York University in 1979. He is a native of Nevada (born 1948), one of the few people of his age who was actually born in the State of Nevada.