Since 1965 he's worked as a gaucho -- the horse-riding ranchers and shepherds of the harsh southern swath of Chile and Argentina known as Patagonia.
Shared between Chile and Argentina, southern Patagonia is chiefly a land of vast, desolate steppes, though the Chilean section also has areas of conifer and beech forest.
Casares grew up in near isolation on a sheep farm in Patagonia, Argentina, some 6, 000 miles away from Palo Alto, California.
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The Amigos de la Patagonia Association has been working on water and education programmes since 1999 with the mission of developing and supporting initiatives that contribute to environment preservation in Argentina, specially in Patagonia.
Oceanwide Expeditions, a Dutch company with an office in Houston, has trips that pass from Ushuaia in Argentina's most southern Patagonia.
Before the carretera (highway), the only road access to this remote part of Patagonia involved travelling through neighbouring Argentina, meaning that the region retains a spectacularly rugged, unspoiled environment and a strong identity.
The trip will be the fourth the Wales national rugby team have made to Argentina, but some Welshmen have previously played rugby in Patagonia.
Along with hundreds of other people from Patagonia, Mr Austin is descended from Welsh-speakers who emigrated to Argentina in the 19th Century, and who still speak Welsh.
Wales leave for Argentina on 1 June and play two Test matches, the first in Puerto Madryn, Patagonia, on 11 June and the second in Buenos Aires on 17 June.
In this framework the purpose of the Amigos de la Patagonia Association is to promote water protection and awareness through formal and non-formal education programmes in Argentina.
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