Beto Marubo, an Indigenous leader of the Marubo People, is one of the most prominent voices in the defense of Isolated Indigenous Peoples in Brazil. As a member of the Union of Indigenous Peoples of the Javari Valley (UNIVAJA), an organization dedicated to the protection and strengthening of Indigenous Peoples in the Javari Valley Indigenous Territory in the state of Amazonas—which is home to the largest number of Indigenous Peoples in Voluntary Isolation in the world—Beto plays a fundamental role in this cause.

He served as a coordinator for Funai’s Ethno-environmental Protection Fronts, where he worked to safeguard the territories of these peoples, including the Javari Valley Ethno-environmental Protection Front (FPEVJ). From 2009 to 2014, he coordinated Funai’s Inspection Sector in Atalaia do Norte and, since 2017, he has represented UNIVAJA in Brasília, serving as part of its coordination.

In collaboration with Bruno Pereira, he founded the UNIVAJA Surveillance Team (EVU), which was recognized by the UN for its innovative work in protecting the Javari Valley Indigenous Land.