Gregory Deyermenjian (born 1949, Boston) is a psychologist and explorer. In 1981 he visited the ruins of Vilcabamba la Vieja at Espíritu Pampa, and then turned his attention to the northeast and north of Cusco, Peru. Since the mid-1980s he has made numerous expeditions to Peru investigating Paititi, a legendary lost city that is part of the history and legend around the western Amazon basin. He is a long-term Fellow of The Explorers Club.
He has participated in extensive explorations and documentation of Incan remains in Mameria (1984,[1] '85, '86, and '89); the first ascent of Apu Catinti (1986); the documentation of Incan "barracks" at Toporake (1989); the exploration and documentation of the petroglyphs at Pusharo (1991);[2] a traverse of the Incan "Road of Stone" past the Plateau of Toporake (1993); the discovery and documentation of Incan and pre-Incan remains in Callanga (1994); the discovery and first ascent of an Incan complex at base of Callanga's peak "Llactapata" (1995); the first visit, exploration, and documentation of the true nature of Manu's Pyramids of Paratoari (1996); following the Incan "Road of Stone" onto the Plateau of Pantiacolla, discovery of "Lago de Ángel" and its Incan platforms north of Río Yavero (1999);[3] and full investigation of claims that Paititi was to be found on Río Choritiari (2000).
In June 2004 the "Quest for Paititi" exploration team of Deyermenjian and ongoing expedition partner Paulino Mamani—along with expedition partner from the 1980s, Goyo Toledo—discovered several important Incan ruins along branches of the Incan Road of Stone at the peak known as Último Punto in the northern part of the Pantiacolla region of Peru.[4] In 2006 Deyermenjian and Mamani returned to the Río Taperachi north of the Yavero, finding the furthest Incan settlements yet identified beyond the highland remains they had found in 2004 at "Último Punto." In 2008 Deyermenjian and Hermógenes Figueroa explored a more southern stretch of the Incan "Road of Stone" and documented the existence of the stone remains of what appears to be an unnamed Incan guardpost complex in the highlands overlooking an entrance to the lowland area of Callanga. In 2009 Deyermenjian and Mamani re-investigated the middle portion of the camino de piedra, the road of stone, coming upon a previously overlooked stretch of road extensively covered in large paving stones and with extensive retaining and containing walls. And in 2011 Deyermenjian´s team extensively explored and formally documented the archaeological complex of "las ruinas de Miraflores" leading up to the Incan barracks of Toporake, on the way towards the Meseta de Pantiacolla, the legendary resing place of the culture-hero Inkarrí at his oasis of "Paititi."
5. Gregory Deyermenjian, "The 1989 Toporake/Paititi Expedition: On the Trail of the Ultimate Refuge of the Incas" in The Explorers Journal, June 1990, Volume 68 Number 2, p. 74-83.
6. Gregory Deyermenjian, "In Search of Paititi: Following the Road of Stone into an Unknown Peru," in The Explorers Journal, Spring 2006 Vol. 84 No. 1, p. 28-35.