Sydney Possuelo

Sydney Ferreira Possuelo (born 19 April 1940, in Santos Dumont) is a Brazilian explorer, social activist and ethnographer who is considered the leading authority on Brazil's remaining isolated Indigenous Peoples.

Sydney Possuelo started his career assisting the famous Villas Boas brothers with their work among indigenous peoples of the Xingu River area.

He was responsible, among others, for the restoration of peaceful relations with the "uncontacted" Korubo Indians, who had previously killed some FUNAI officials, including Possuelo's close friend Raimundo (Sobral) Batista Magalhães.

His efforts have made him the foremost authority in the field, a spokesman for the indigenous tribes of the Amazon region and one of the most admired and decorated activists in the world.

It details a 76-day expedition in 2002 led by Possuelo to find the status of the "Arrow People", an uncontacted tribe in the Vale do Javari Indigenous Land.