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Rosario Maffrand started their work experience in 2010 as a Junior Counsel at Martelli Abogados, where they advised oil and gas companies on commercial agreements, government relations, regulatory matters, and antitrust issues. Rosario also drafted and negotiated marketing and transportation agreements and provided advice on regulatory matters related to energy projects.

In 2014, Maffrand joined Madalena Energy Argentina as a Semi Senior Counsel. Their role involved negotiating and drafting various agreements related to the oil industry, particularly those involving joint ventures, block acquisitions, and commercial activities. Rosario was also responsible for negotiating commitments with provinces and maintaining relationships with landowners.

Since 2018, Maffrand has been working as a Senior Counsel at Vista, although specific details of their role and responsibilities are not provided.

Rosario Maffrand has a diverse education history. In 2014, they obtained a degree in Law, specializing in Tax Law, from the University of Buenos Aires. Following this, in 2016-2017, they pursued a Master's degree in Law and Economics from the Universidad Torcuato Di Tella. In 2017-2018, they furthered their education by completing a Master's program in Law and Economics at Università Bocconi. In 2015, they briefly participated in a program on Corporate Law at the University of Buenos Aires. Most recently, in 2021, Rosario Maffrand completed a Diploma in Renewable Energy and Storage at Universidad del CEMA. These educational experiences have equipped their with a strong foundation in law and economics, with a particular focus on tax law and renewable energy.