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Celso Vianna, MBA, currently serves as the Chief Accounting Officer and VP Group Controller at Millicom (Tigo), where major responsibilities include leading a Finance Transformation Program, overseeing consolidation and financial reporting activities related to mergers and acquisitions, and managing group accounting and internal controls compliance. Previously, Celso held pivotal roles at Walmart, including Senior Director Controller for the Central America Region, responsible for financial reporting and compliance across multiple countries. An extensive background includes leadership positions at Ernst & Young and a significant tenure in corporate accounting roles at Fortune 500 companies. Celso holds an MBA from the University of Arkansas and multiple accounting certifications.