Foreign explorers who have come to the plains of Roraima to explore the area with Stevenson have included the Paititi investigator Gregory Deyermenjian, who in 1997 documented Stevenson's finds, and the likely correctness of Stevenson's conclusions concerning the pre-history of the region, in expedition reports filed at the Explorers Club headquarters in New York City.
Deyermenjian, G. (1988) Land Rights, Cultural Survival and Innovation among Indigenous Peoples of the Western Amazon Basin: The Case of the Machiguenga. Master's Thesis, Clark University, International Development Dept.
Between 1984 and 1989 the American explorer Gregory Deyermenjian made five expeditions to Mameria—for three of which he was accompanied by Peruvian explorer Paulino Mamani H.--conducting anthropological as well as archaeological research concerning the area's Machiguenga inhabitants and ancient archaeological remains.
In August 1996 Boston-based explorer Gregory Deyermenjian of The Explorers Club, along with exploration partner, Peru's Paulino Mamani, and Peru's Dante Núñez del Prado, Fernando Neuenschwander, Ignacio Mamani, and Machiguenga "Roberto" and his wife "Grenci" and baby daughter "Reina", was first to make an on-site exploration.
In 1991 the party of North American explorer Gregory Deyermenjian, including Peruvian explorer Paulino Mamani and the previously mentioned Santiago Yábar, arrived at Pusharo.
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