Prior to joining Crowell & Moring, Dan was a director in a national accounting firm providing customs and international trade guidance to multinational clients related to the supply and distribution of goods and services across international borders. Areas of specialization included antidumping and countervailing duties and policy, trade remedies and litigation, free trade agreements and negotiations, classification and valuation, and international trade and development.

Dan's government appointments include service to U.S. Trade Representative on the roster of international trade practitioners to resolve antidumping disputes involving NAFTA members. For the European Commission, Dan provided advice and training on international trade and antidumping methodology and practice. In addition, Dan has served as an international trade consultant to the governments of Guatemala and Singapore, providing technical advice to these governments on the application of international trade regulations consistent with international law and World Trade Organization agreements and the General Agreement on Tariffs and Trade, Agreement on Antidumping.