On December 6, 2010, the Seminar organized by the Transnational Taxation Network (TTN) was held in Marval, O'Farrell and Mairal's offices, in which both local and foreign speakers lectured on several international taxation issues. Among the speakers were Juan Pablo Rothschild, who lectured on Value Added Tax (VAT) applicable to the import and export of services in Argentina, and Valeria D'Alessandro, who spoke on Resolution of international tax disputes through arbitration.