Ph.D. Candidate at NOVA School of Law and a Research Fellow at Fundação para a Ciência e a Tecnologia, I.P. (FCT). Participated as an Accredited Observer, on behalf NOVA Tax Research Lab, at the First and Second Sessions of the Intergovernmental Negotiating Committee on the United Nations Framework Convention on International Tax Cooperation (New York, 4-15 August 2025). Participated as an Accredited Observer, on behalf NOVA Tax Research Lab, at the second session of the United Nations AD-HOC TAX COMMITTEE to draft terms of reference for a UN framework convention on international tax cooperation (New York, 20 July-16 August 2024). Mariana was selected to participate in the Poster Programme at the IFA 2025 Congress in October in Lisbon and received the prize (EUR 500) for her outstanding work. Mariana was a Guest Teaching Assistant in the Public Law Department at NOVA School of Law during the 2021/2022 academic year. She is a founding member of NOVA Tax Research Lab, where she works as a senior researcher and member of the coordination team.. Additionally, she is a researcher at the Centre for Research & Development on Law and Society (CEDIS). She holds a Master’s degree in International and European Law from NOVA School of Law, Universidade Nova de Lisboa (2021), having graduated with a final average of 18. She was awarded the Bolsa de Mérito (Merit Scholarship) for the 2018/2019 academic year in recognition of her second-place ranking in the curricular phase of the Master’s programme. Her Master’s thesis, Tax Ruling, State Aid, and Fiscal Competition in the European Environment – An Analysis of the Decisions Issued by the European Commission’s Task Force on Tax Planning Practices, was awarded 18 points in the Master’s Examination. In 2024, Mariana joined the Extension Group Women and Taxation: Between Budget and Public Policies at the University of São Paulo (USP). In 2025, she became a member of the Fiscal Justice and Gender Research Group at the State University of Rio de Janeiro (UERJ). Mariana has been a Guest Assistant Professor in Tax Law at Universidade de Araraquara since 2015 and, since 2023, has also lectured in Private International Law and Law and Globalisation. She obtained her Law degree from Universidade de Araraquara (2009) and completed a postgraduate specialisation in Tax Law at the Instituto Brasileiro de Estudos Tributários (IBET) in 2013. She is also a Partner at Passos, Souza e Silva Advogados Associados. Mariana is also a co-editor of the NOVA Tax Research Series. In 2023, she co-authored The Importance of Paying the Fair Share for the Fulfilment of Economic, Social, and Cultural Rights, and in 2024, she published Taxation, Gender Equality, and the 2030 Agenda. That same year, representing the NOVA Tax Research Lab, she attended the second session of the ToR discussions at the United Nations headquarters in New York, where she presented statements on gender equality and tax education. In 2022, she was a member of the research team dedicated to studying and monitoring the activities of Regional Integration Courts at the Núcleo de Estudos em Tribunais Internacionais (NETI-USP) at the Faculty of Law of the University of São Paulo. Her primary research fields are European and International Law, with a particular interest in Law and Globalisation, International Tax Law, Sustainable Development, and International Cooperation. Her work focuses on tax competition and gender equality.