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Maria Tronnolone Valencia has extensive experience in accounting and human resources, currently serving as a Senior Accountant and HR Assistant at the European Respiratory Society since June 2011. Previous roles include Accountant for the Commissione Paritetica Cantonale dell'Edilizia, where responsibilities involved bookkeeping for cantonal committees and credit collection, and GL Accountant at Kerr Corporation, focusing on financial accounting and reporting under US GAAP. Maria also held accounting positions at Unifida Finance and Palo Alto System Sagl, in addition to serving as Secretary-Accountant at Garage Dario Branchi, where various financial tasks, including payroll administration and VAT declaration, were managed. Early career experience includes administrative support and a commercial apprenticeship at Saces SA and Electroform, respectively.