This article deals with the professional work of the librarian Ricardo Gietz, between the Welfare State developed by Peronism to the dismantling of the same by neoliberalism in the 1990s. The interest in the figure of Gietz is in that he was the only Latin American who was in charge of the presidency of FID, was the director of CAICYT, and of Latin American Service on Translation Information of UNESCO in Argentina, among other charges in national and international organizations. He was one of the most important documentalists in the country, however, he is unknown to the new generations of information workers. Along with his father, who was also a librarian, they played a key role in the implementation of documental and library policies and, in some cases, continue to bear fruit inside and outside CONICET.