Along with working on regulatory matters related to imports and exports, Mark has represented numerous foreign producers in antidumping and countervailing duty cases. In particular, Mark and his clients obtained a zero margin in three consecutive reviews in the antidumping proceeding against salmon from Chile and revocation from the case. He has won negative injury determinations at the International Trade Commission for a Canadian stainless steel wire producer and a Thai PET film producer. Mark has worked on every antidumping proceeding against Russia since it gained market economy status. He has also worked on subsidy cases in India, Thailand, Korea, and the EU.

Mark has worked on foreign antidumping proceedings, including those before the EU, in which the case was revoked, and China, winning the first negative injury determination for a Thai plastics producer.

Additionally, Mark counsels clients on market access issues under the WTO rules. He has successfully worked with a number of clients who were denied access to markets due to actions of governments that were inconsistent with WTO Rules. He has also defended the Korean shipbuilding industry in actions brought by the European industry alleging that the Korean industry had received unfair subsidies as a result of corporate restructuring.

Mark also advises clients on customs and compliance issues. He does work related to US export control laws, customs protests, and focused assessments as well as valuation and classification issues. He also advises clients on export control and Foreign Corrupt Practices Act (FCPA) matters. He has worked for foreign food producers on matters involving US food safety regulation and other regulatory requirements. He also advises clients on matters related to foreign transactions including joint venture agreements and purchase and sale agreements.